Fix unit tests

[YigitElma]

The new releases for Python 3.12 and 3.11 introduced some changes to the activation of virtual environments that made the venvs incompatible between Python patched 3.12.8 and 3.12.7 which Github runners use. This caused the unit tests to fail (since they are the only ones that use 3.12. and 3.11).

This PR changes the caching procedure to include the full Python version and use it if it is the same as the runners use. Otherwise, create a new environment for that job, so it will run either way.

Note: I believe this problem will be resolved automatically once all Github runners use the same Python version (they released new patch last week so it might take another week). But these changes will make it ready for future releases.

[YigitElma]

Probably related to python/cpython#124651
They changed venv activation for python 3.11.11 and 3.12.8 which the job runner recently started to use

[f0uriest]

If we can't get this working can we just drop the caching and go back to installing each time? It only takes like ~1 minute

[f0uriest]

instead of using matrix.python-version as the key why can't we use the actual version from python --version

[YigitElma]

I think we can. I don't know if the syntax will allow it, but that could resolve inconsistent Python version problem. However, we might need to clean some old cache created with older Python versions every 3-4 months.

[YigitElma]

Btw this problem will probably be solved when every Github runner starts using 3.12.8 and 3.11.11. For now, some of them use 3.12.7 and this causes the issue. They made some security changes regarding the venv activation with the latest patch

[github-actions]

|             benchmark_name             |         dt(%)          |         dt(s)          |        t_new(s)        |        t_old(s)        | 
| -------------------------------------- | ---------------------- | ---------------------- | ---------------------- | ---------------------- |
 test_build_transform_fft_lowres         |    +10.37 +/- 9.99     | +5.43e-02 +/- 5.24e-02 |  5.78e-01 +/- 2.9e-02  |  5.24e-01 +/- 4.4e-02  |
-test_equilibrium_init_medres            |    +14.06 +/- 3.44     | +5.75e-01 +/- 1.41e-01 |  4.66e+00 +/- 9.9e-02  |  4.09e+00 +/- 1.0e-01  |
 test_equilibrium_init_highres           |     +1.34 +/- 5.34     | +7.42e-02 +/- 2.95e-01 |  5.61e+00 +/- 2.3e-01  |  5.53e+00 +/- 1.8e-01  |
 test_objective_compile_dshape_current   |     +2.02 +/- 5.36     | +7.96e-02 +/- 2.11e-01 |  4.01e+00 +/- 4.1e-02  |  3.93e+00 +/- 2.1e-01  |
 test_objective_compute_dshape_current   |     +0.01 +/- 2.66     | +5.25e-07 +/- 1.38e-04 |  5.19e-03 +/- 3.9e-05  |  5.19e-03 +/- 1.3e-04  |
 test_objective_jac_dshape_current       |     +3.25 +/- 8.99     | +1.40e-03 +/- 3.88e-03 |  4.46e-02 +/- 2.3e-03  |  4.32e-02 +/- 3.1e-03  |
 test_perturb_2                          |     +0.46 +/- 5.94     | +9.16e-02 +/- 1.18e+00 |  2.00e+01 +/- 1.1e+00  |  1.99e+01 +/- 3.8e-01  |
 test_proximal_freeb_jac                 |     -0.40 +/- 0.87     | -2.95e-02 +/- 6.43e-02 |  7.36e+00 +/- 4.0e-02  |  7.39e+00 +/- 5.1e-02  |
 test_solve_fixed_iter                   |     -3.48 +/- 2.13     | -1.19e+00 +/- 7.28e-01 |  3.31e+01 +/- 5.6e-01  |  3.42e+01 +/- 4.6e-01  |
 test_LinearConstraintProjection_build   |     -5.49 +/- 4.84     | -5.89e-01 +/- 5.19e-01 |  1.01e+01 +/- 2.2e-01  |  1.07e+01 +/- 4.7e-01  |
 test_build_transform_fft_midres         |     -0.81 +/- 3.49     | -4.96e-03 +/- 2.15e-02 |  6.09e-01 +/- 1.6e-02  |  6.14e-01 +/- 1.4e-02  |
 test_build_transform_fft_highres        |     -0.10 +/- 1.89     | -1.01e-03 +/- 1.84e-02 |  9.74e-01 +/- 1.5e-02  |  9.75e-01 +/- 1.1e-02  |
 test_equilibrium_init_lowres            |     -1.30 +/- 1.52     | -5.10e-02 +/- 5.95e-02 |  3.87e+00 +/- 3.1e-02  |  3.92e+00 +/- 5.1e-02  |
 test_objective_compile_atf              |     +1.06 +/- 4.47     | +8.62e-02 +/- 3.64e-01 |  8.22e+00 +/- 2.5e-01  |  8.13e+00 +/- 2.7e-01  |
 test_objective_compute_atf              |     -0.21 +/- 2.89     | -3.33e-05 +/- 4.63e-04 |  1.60e-02 +/- 3.0e-04  |  1.60e-02 +/- 3.5e-04  |
 test_objective_jac_atf                  |     +0.02 +/- 2.43     | +4.42e-04 +/- 4.81e-02 |  1.98e+00 +/- 3.6e-02  |  1.98e+00 +/- 3.2e-02  |
 test_perturb_1                          |     -0.54 +/- 1.34     | -8.05e-02 +/- 2.00e-01 |  1.48e+01 +/- 1.2e-01  |  1.49e+01 +/- 1.6e-01  |
 test_proximal_jac_atf                   |     +1.04 +/- 0.73     | +8.65e-02 +/- 6.05e-02 |  8.37e+00 +/- 4.5e-02  |  8.29e+00 +/- 4.1e-02  |
 test_proximal_freeb_compute             |     -0.79 +/- 1.03     | -1.60e-03 +/- 2.09e-03 |  2.00e-01 +/- 1.5e-03  |  2.02e-01 +/- 1.4e-03  |
 test_solve_fixed_iter_compiled          |     +0.47 +/- 1.10     | +1.03e-01 +/- 2.42e-01 |  2.21e+01 +/- 1.7e-01  |  2.20e+01 +/- 1.7e-01  |

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.57%. Comparing base (4ed87cb) to head (4001b97).
Report is 28 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1462   +/-   ##
=======================================
  Coverage   95.57%   95.57%           
=======================================
  Files          98       98           
  Lines       25156    25156           
=======================================
+ Hits        24043    24044    +1     
+ Misses       1113     1112    -1     

see 1 file with indirect coverage changes