chore(deps): update actions/checkout digest to c2d88d3

Signed-off-by: renovate-sh-app[bot] <219655108+renovate-sh-app[bot]@users.noreply.github.com>

Author: renovate-sh-app[bot]

.github/workflows/renovate.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ${{ github.repository_owner == 'grafana' && 'ubuntu-x64-small' || 'ubuntu-latest' }}
     steps:
       - name: Checkout code
-        uses: actions/checkout@71cf2267d89c5cb81562390fa70a37fa40b1305e
+        uses: actions/checkout@c2d88d3ecc89a9ef08eebf45d9637801dcee7eb5
         with:
           persist-credentials: false