build(deps): bump python-levenshtein in /lib/spack/docs

Bumps [python-levenshtein](https://github.com/rapidfuzz/python-Levenshtein) from 0.24.0 to 0.25.1.
- [Release notes](https://github.com/rapidfuzz/python-Levenshtein/releases)
- [Changelog](https://github.com/rapidfuzz/python-Levenshtein/blob/main/HISTORY.md)
- [Commits](rapidfuzz/python-Levenshtein@v0.24.0...v0.25.1)

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

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

lib/spack/docs/requirements.txt

@@ -2,7 +2,7 @@ sphinx==7.2.6
 sphinxcontrib-programoutput==0.17
 sphinx_design==0.5.0
 sphinx-rtd-theme==2.0.0
-python-levenshtein==0.24.0
+python-levenshtein==0.25.1
 docutils==0.20.1
 pygments==2.17.2
 urllib3==2.2.0