build(deps): bump mypy from 1.8.0 to 1.10.0 in /lib/spack/docs

Bumps [mypy](https://github.com/python/mypy) from 1.8.0 to 1.10.0.
- [Changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md)
- [Commits](python/mypy@v1.8.0...v1.10.0)

---
updated-dependencies:
- dependency-name: mypy
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

lib/spack/docs/requirements.txt

@@ -10,4 +10,4 @@ pytest==8.0.0
 isort==5.13.2
 black==24.1.1
 flake8==7.0.0
-mypy==1.8.0
+mypy==1.10.0