Build(deps-dev): Bump nox from 2025.11.12 to 2026.2.9

Bumps [nox](https://github.com/wntrblm/nox) from 2025.11.12 to 2026.2.9.
- [Release notes](https://github.com/wntrblm/nox/releases)
- [Changelog](https://github.com/wntrblm/nox/blob/main/CHANGELOG.md)
- [Commits](wntrblm/nox@2025.11.12...2026.02.09)

---
updated-dependencies:
- dependency-name: nox
  dependency-version: 2026.2.9
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

pyproject.toml

@@ -76,7 +76,7 @@ dev-mypy = [
   "frequenz-gridpool[dev-mkdocs,dev-noxfile,dev-pytest]",
 ]
 dev-noxfile = [
-  "nox == 2025.11.12",
+  "nox == 2026.2.9",
   "frequenz-repo-config[lib] == 0.16.0",
 ]
 dev-pylint = [