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

.github/workflows/playwright.yml

@@ -9,7 +9,7 @@ jobs:
     timeout-minutes: 60
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+    - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
     - uses: actions/setup-node@395ad3262231945c25e8478fd5baf05154b1d79f # v6
       with:
         node-version: lts/*

.github/workflows/supply-chain-verify.yml

@@ -43,7 +43,7 @@ jobs:
          github.event.workflow_run.event != 'pull_request'))
     steps:
       - name: Checkout
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd  # v5.0.1
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8  # v6.0.1
 
       # Debug: Log workflow_run context for initial validation (can be removed after confidence)
       - name: Debug Workflow Run Context
@@ -628,7 +628,7 @@ jobs:
     needs: verify-sbom
     steps:
       - name: Checkout
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd  # v5.0.1
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8  # v6.0.1
 
       - name: Install Verification Tools
         run: |
@@ -725,7 +725,7 @@ jobs:
     if: github.event_name == 'release'
     steps:
       - name: Checkout
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd  # v5.0.1
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8  # v6.0.1
 
       - name: Install Verification Tools
         run: |