Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/cla.yml

@@ -21,7 +21,7 @@ jobs:
           egress-policy: audit
 
       - name: Checkout Private Repo for Allowlist
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 #v4.2.2
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           repository: OpenZeppelin/cla-sigs
           token: ${{ secrets.CLA_SIGS_ACCESS_PAT }}

.github/workflows/test.yml

@@ -13,7 +13,7 @@ jobs:
         working-directory: ./contracts
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v6
         with:
           submodules: true