MAINT: Do not extract the CP2K version via cp2k.popt --version

[BvB93]

Using cp2k.popt --version can fail if the CP2K version used for constructing a given output is
different from the version that's currently loaded.
Instead, read the version directly from the .out file.

[codecov]

Codecov Report

Merging #290 (d3e9bc8) into master (96112f7) will decrease coverage by 0.12%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #290      +/-   ##
==========================================
- Coverage   81.67%   81.54%   -0.13%     
==========================================
  Files          42       42              
  Lines        2275     2259      -16     
  Branches      380      376       -4     
==========================================
- Hits         1858     1842      -16     
+ Misses        318      317       -1     
- Partials       99      100       +1     

Impacted Files	Coverage Δ
src/qmflows/parsers/cp2KParser.py	71.91% <66.66%> (-1.46%)	⬇️

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