[.github/workflows] Update actions/cache action to v5

Author: renovate[bot]

.github/workflows/validate.yaml

@@ -27,7 +27,7 @@ jobs:
 
       - name: Cache CRDs
         id: crd
-        uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
+        uses: actions/cache@8b402f58fbc84540c8b491a91e594a4576fec3d7 # v5.0.2
         with:
           path: .crd
           key: crd-${{ hashFiles('./scripts/setup-crd.sh') }}