Release 2.6.0

[mavaylon1]

Prepare for release of PyNWB [version]

Before merging:

• Major and minor releases: Update package versions in requirements.txt, requirements-dev.txt,
  requirements-doc.txt, requirements-min.txt, environment-ros3.yml, and setup.py as needed.
• Check legal file dates and information in Legal.txt, license.txt, README.rst, docs/source/conf.py,
  and any other locations as needed
• Update setup.py as needed
• Update README.rst as needed
• Update src/pynwb/nwb-schema submodule as needed. Check the version number and commit SHA manually
• Update changelog (set release date) in CHANGELOG.md and any other docs as needed
• Run tests locally including gallery, validation, and streaming tests, and inspect all warnings and outputs
  (python test.py -v -p -i -b -w -r > out.txt 2>&1)
• Test docs locally (make clean, make html)
• Push changes to this PR and make sure all PRs to be included in this release have been merged
• Check that the readthedocs build for this PR succeeds (build latest to pull the new branch, then activate and
  build docs for new branch): https://readthedocs.org/projects/pynwb/builds/

After merging:

1. Create release by following steps in docs/source/make_a_release.rst or use alias git pypi-release [tag] if set up
2. After the CI bot creates the new release (wait ~10 min), update the release notes on the
   GitHub releases page with the changelog
3. Check that the readthedocs "latest" and "stable" builds run and succeed
4. Update conda-forge/pynwb-feedstock with the latest version number
   and SHA256 retrieved from PyPI > PyNWB > Download Files > View hashes for the .tar.gz file. Re-render as needed

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0a70990) 91.95% compared to head (e4df64d) 91.95%.

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1849   +/-   ##
=======================================
  Coverage   91.95%   91.95%           
=======================================
  Files          27       27           
  Lines        2661     2661           
  Branches      699      699           
=======================================
  Hits         2447     2447           
  Misses        142      142           
  Partials       72       72           

Flag	Coverage Δ
integration	70.80% <ø> (ø)
unit	84.14% <ø> (ø)

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