Bump the dev-dependencies group across 1 directory with 3 updates

Bumps the dev-dependencies group with 3 updates in the / directory: [flake8-rst-docstrings](https://github.com/peterjc/flake8-rst-docstrings), [pytest](https://github.com/pytest-dev/pytest) and [fastapi](https://github.com/fastapi/fastapi).


Updates `flake8-rst-docstrings` from 0.3.0 to 0.3.1
- [Commits](peterjc/flake8-rst-docstrings@v0.3.0...v0.3.1)

Updates `pytest` from 8.3.4 to 8.3.5
- [Release notes](https://github.com/pytest-dev/pytest/releases)
- [Changelog](https://github.com/pytest-dev/pytest/blob/main/CHANGELOG.rst)
- [Commits](pytest-dev/pytest@8.3.4...8.3.5)

Updates `fastapi` from 0.115.8 to 0.115.12
- [Release notes](https://github.com/fastapi/fastapi/releases)
- [Commits](fastapi/fastapi@0.115.8...0.115.12)

---
updated-dependencies:
- dependency-name: flake8-rst-docstrings
  dependency-version: 0.3.1
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
- dependency-name: pytest
  dependency-version: 8.3.5
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
- dependency-name: fastapi
  dependency-version: 0.115.12
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: dev-dependencies
...

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Author: dependabot[bot]