fix: properly manage pyproject.toml version

[chanind]

Description

Our previous semantic release setup updates the pyproject.toml:version variable. However, this also has the unintended side-effect of replacing any version = string in pyproject.toml with the new SAELens version. This broke black, since it now has an explicit version = string set, as can be seen here: e2a692a#diff-50c86b7ed8ac2cf95bd48334961bf0530cdc77b5a56f852c5c61b89d735fd711R44.

Fortunately, semantic-release has a version_toml option which handles exactly this situation (their example even includes a Poetry pyproject.toml).

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have not rewritten tests relating to key interfaces which would affect backward compatibility

You have tested formatting, typing and unit tests (acceptance tests not currently in use)

• I have run make check-ci to check format and linting. (you can run make format to format code if needed.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.43%. Comparing base (5e70edc) to head (f11a55c).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #325   +/-   ##
=======================================
  Coverage   62.43%   62.43%           
=======================================
  Files          25       25           
  Lines        3144     3144           
  Branches      550      550           
=======================================
  Hits         1963     1963           
  Misses       1077     1077           
  Partials      104      104           

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[chanind]

Merging as CI is currently broken and this should be fairly non-controversial