build(deps): bump ruff from 0.9.3 to 0.9.4 in /nvim/langservers

Bumps [ruff](https://github.com/astral-sh/ruff) from 0.9.3 to 0.9.4.
- [Release notes](https://github.com/astral-sh/ruff/releases)
- [Changelog](https://github.com/astral-sh/ruff/blob/main/CHANGELOG.md)
- [Commits](astral-sh/ruff@0.9.3...0.9.4)

---
updated-dependencies:
- dependency-name: ruff
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

nvim/langservers/requirements.txt

@@ -49,7 +49,7 @@ pyupgrade==3.19.1
     # via -r requirements.in
 reorder-python-imports==3.14.0
     # via -r requirements.in
-ruff==0.9.3
+ruff==0.9.4
     # via -r requirements.in
 tokenize-rt==6.1.0
     # via