build(deps): bump the test-and-lint-dependencies group with 2 updates

Bumps the test-and-lint-dependencies group with 2 updates: [ruff](https://github.com/astral-sh/ruff) and [mypy](https://github.com/python/mypy).


Updates `ruff` from 0.15.8 to 0.15.9
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.15.8...0.15.9)

Updates `mypy` from 1.19.1 to 1.20.0
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.19.1...v1.20.0)

---
updated-dependencies:
- dependency-name: ruff
  dependency-version: 0.15.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: test-and-lint-dependencies
- dependency-name: mypy
  dependency-version: 1.20.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: test-and-lint-dependencies
...

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

Author: dependabot[bot]

requirements/lint.txt

@@ -6,8 +6,8 @@
 # Lint tools
 # (We are not so interested in the specific versions of the tools: the versions
 # are pinned to prevent unexpected linting failures when tools update)
-ruff==0.15.8
-mypy==1.19.1
+ruff==0.15.9
+mypy==1.20.0
 zizmor==1.23.1
 
 # Required for type stubs