Bump actions/checkout from 4.2.2 to 6.0.1

.github/workflows/main.yml

@@ -26,7 +26,7 @@ jobs:
           - '4.0'
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+      - uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
         with:
           persist-credentials: false
       - name: Set up Ruby

.github/workflows/zizmor.yml

@@ -22,7 +22,7 @@ jobs:
       actions: read # query workflow runs
     steps:
       - name: Checkout repository
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8
         with:
           persist-credentials: false