chore(deps): pin dependencies (#9)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/cache](https://github.com/actions/cache) | action | pinDigest |  -> `0057852` |
| [actions/checkout](https://github.com/actions/checkout) | action | pinDigest |  -> `08c6903` |

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Reviewed-on: t.behrendt/trivy-actions#9
Reviewed-by: t.behrendt <t.behrendt@noreply.localhost>
Co-authored-by: Renovate Bot <renovate@t00n.de>
Co-committed-by: Renovate Bot <renovate@t00n.de>

setup-db/action.yaml

@@ -19,7 +19,7 @@ runs:
       run: |
         echo "current-date=$(date +%Y-%m-%d)" >> $GITHUB_OUTPUT
     - id: restore-db
-      uses: actions/cache@v4
+      uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4
       with:
         path: ${{ inputs.cache-dir }}
         key: trivy-db-${{ steps.current-date.outputs.current-date }}