Bump pyupgrade from 3.21.0 to 3.21.1 (#344)

Bumps [pyupgrade](https://github.com/asottile/pyupgrade) from 3.21.0 to 3.21.1.
- [Commits](asottile/pyupgrade@v3.21.0...v3.21.1)

---
updated-dependencies:
- dependency-name: pyupgrade
  dependency-version: 3.21.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pyproject.toml

@@ -64,7 +64,7 @@ dev = [
     "types-docutils==0.22.2.20251006",
     "yesqa==1.5.0",
     "types-PyYAML==6.0.12.20250915",
-    "pyupgrade==3.21.0",
+    "pyupgrade==3.21.1",
     "toml-sort==0.24.3",
     "pylint-per-file-ignores==3.1.0",
     "uv==0.9.8",