Update pre-commit hook astral-sh/ruff-pre-commit to v0.15.21 (#4623)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.pre-commit-config.yaml

@@ -1,7 +1,7 @@
 default_stages: ['pre-commit']
 repos:
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.15.20
+    rev: v0.15.21
     hooks:
         # fix unused imports and sort them
       - id: ruff