[pre-commit.ci] pre-commit autoupdate (#140)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -6,7 +6,7 @@ repos:
     - id: trailing-whitespace
 - repo: https://github.com/astral-sh/ruff-pre-commit
   # Ruff version.
-  rev: v0.15.20
+  rev: v0.15.21
   hooks:
     # Run the linter.
     - id: ruff