chore(deps): update actions/checkout action to v6

Ref: PACT-445

Author: pactflow-renovate-bot[bot]

.github/workflows/ci.yaml

@@ -21,7 +21,7 @@ jobs:
         node: [22, 24]
     steps:
       - name: Checkout code
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
       - name: Use node@${{ matrix.node }}
         uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6
         with:
@@ -44,7 +44,7 @@ jobs:
     if: ${{ github.repository_owner == 'pactflow' && github.event_name == 'push' }}
     steps:
       - name: Checkout code
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
       - name: Setup node
         uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6
         with: