Make release v23.9

[Saransh-cpp]

Description

I will create a release once this is merged into main.

Fixes #3374

Type of change

Please add a line in the relevant section of CHANGELOG.md to document the change (include PR #) - note reverse order of PR #s. If necessary, also add to the list of breaking changes.

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist:

• No style issues: $ pre-commit run (or $ nox -s pre-commit) (see CONTRIBUTING.md for how to set this up to run automatically when committing locally, in just two lines of code)
• All tests pass: $ python run-tests.py --all (or $ nox -s tests)
• The documentation builds: $ python run-tests.py --doctest (or $ nox -s doctests)

You can run integration tests, unit tests, and doctests together at once, using $ python run-tests.py --quick (or $ nox -s quick).

Further checks:

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[review-notebook-app]

Check out this pull request on 

See visual diffs & provide feedback on Jupyter Notebooks.

---

Powered by ReviewNB

[brosaplanella]

Looks good to me, thanks! Are the mac failing tests new?

[Saransh-cpp]

Yes, looks like a new error. I will try rerunning them once the other tests are executed.

[codecov]

Codecov Report

Attention: 39 lines in your changes are missing coverage. Please review.

Comparison is base (9efd58b) 99.71% compared to head (e00b0d5) 99.58%.
Report is 5 commits behind head on main.

Files	Patch %	Lines
pybamm/models/submodels/particle/msmr_diffusion.py	93.24%	16 Missing ⚠️
pybamm/solvers/jax_solver.py	79.31%	6 Missing ⚠️
...s/full_battery_models/lithium_ion/electrode_soh.py	97.69%	5 Missing ⚠️
...amm/models/full_battery_models/lithium_ion/msmr.py	72.22%	5 Missing ⚠️
...odels/interface/open_circuit_potential/msmr_ocp.py	88.88%	3 Missing ⚠️
...m/models/full_battery_models/base_battery_model.py	96.87%	2 Missing ⚠️
...submodels/interface/kinetics/msmr_butler_volmer.py	96.49%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3538      +/-   ##
==========================================
- Coverage   99.71%   99.58%   -0.13%     
==========================================
  Files         248      256       +8     
  Lines       18900    20106    +1206     
==========================================
+ Hits        18846    20023    +1177     
- Misses         54       83      +29     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[Saransh-cpp]

Looks like this has been fixed in develop, but not in v23.9. The scheduled macos tests are passing on this PR so it should be fine to merge this.

Leaving this open for reviews. Will merge this in an hour!

[agriyakhetarpal]

Looks good, thanks, @Saransh-cpp! The macOS tests are failing because of the brew update command, which has been fixed in the develop branch as you mentioned.