Update pre-commit hook keith/pre-commit-buildifier to v8.2.1

Author: renovate[bot]

.pre-commit-config.yaml

@@ -30,7 +30,7 @@ repos:
       - id: trailing-whitespace
   # Check formatting and lint for starlark code
   - repo: https://github.com/keith/pre-commit-buildifier
-    rev: 8.2.0
+    rev: 8.2.1
     hooks:
       - id: buildifier
       - id: buildifier-lint