ci: pre-commit autoupdate

updates:
- [github.com/google/yamlfmt: v0.20.0 → v0.21.0](google/yamlfmt@v0.20.0...v0.21.0)

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -100,7 +100,7 @@ repos:
       - id: uv-lock
 
   - repo: https://github.com/google/yamlfmt
-    rev: v0.20.0
+    rev: v0.21.0
     hooks:
       - id: yamlfmt