Deps: Bump the python-packages group with 6 updates

Bumps the python-packages group with 6 updates:

| Package | From | To |
| --- | --- | --- |
| [coverage](https://github.com/coveragepy/coveragepy) | `7.15.0` | `7.15.1` |
| [anyio](https://github.com/agronholm/anyio) | `4.14.1` | `4.14.2` |
| [librt](https://github.com/mypyc/librt) | `0.12.0` | `0.13.0` |
| [mypy](https://github.com/python/mypy) | `2.1.0` | `2.2.0` |
| [ruff](https://github.com/astral-sh/ruff) | `0.15.20` | `0.15.21` |
| [tzdata](https://github.com/python/tzdata) | `2026.2` | `2026.3` |


Updates `coverage` from 7.15.0 to 7.15.1
- [Release notes](https://github.com/coveragepy/coveragepy/releases)
- [Changelog](https://github.com/coveragepy/coveragepy/blob/main/CHANGES.rst)
- [Commits](coveragepy/coveragepy@7.15.0...7.15.1)

Updates `anyio` from 4.14.1 to 4.14.2
- [Release notes](https://github.com/agronholm/anyio/releases)
- [Commits](agronholm/anyio@4.14.1...4.14.2)

Updates `librt` from 0.12.0 to 0.13.0
- [Commits](mypyc/librt@v0.12.0...v0.13.0)

Updates `mypy` from 2.1.0 to 2.2.0
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v2.1.0...v2.2.0)

Updates `ruff` from 0.15.20 to 0.15.21
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.15.20...0.15.21)

Updates `tzdata` from 2026.2 to 2026.3
- [Release notes](https://github.com/python/tzdata/releases)
- [Changelog](https://github.com/python/tzdata/blob/master/NEWS.md)
- [Commits](python/tzdata@2026.2...2026.3)

---
updated-dependencies:
- dependency-name: coverage
  dependency-version: 7.15.1
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: python-packages
- dependency-name: anyio
  dependency-version: 4.14.2
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: python-packages
- dependency-name: librt
  dependency-version: 0.13.0
  dependency-type: indirect
  update-type: version-update:semver-minor
  dependency-group: python-packages
- dependency-name: mypy
  dependency-version: 2.2.0
  dependency-type: indirect
  update-type: version-update:semver-minor
  dependency-group: python-packages
- dependency-name: ruff
  dependency-version: 0.15.21
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: python-packages
- dependency-name: tzdata
  dependency-version: '2026.3'
  dependency-type: indirect
  update-type: version-update:semver-minor
  dependency-group: python-packages
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]