Update pre-commit hook gitleaks/gitleaks to v8.21.1

| datasource  | package           | from    | to      |
| ----------- | ----------------- | ------- | ------- |
| github-tags | gitleaks/gitleaks | v8.20.1 | v8.21.1 |


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

.pre-commit-config.yaml

@@ -25,7 +25,7 @@ repos:
       - id: detect-private-key
 
   - repo: https://github.com/gitleaks/gitleaks
-    rev: v8.20.1
+    rev: v8.21.1
     hooks:
       - id: gitleaks