chore: Update actions/checkout action to v4.2.2 (#261)

Co-authored-by: grafanarenovatebot[bot] <146220760+grafanarenovatebot[bot]@users.noreply.github.com>
Co-authored-by: Dougal Matthews <dougal@grafana.com>

Author: grafanarenovatebot[bot]

.github/workflows/validate-policy-bot-config.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@692973e3d937129bcbf40652eb9f2f61becf3332 # v4.1.7
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           persists-credentials: false