chore(github-action): update actions/checkout digest to 8e8c483 (#42337)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://redirect.github.com/actions/checkout) |
action | digest | `1af3b93` -> `8e8c483` |

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.github/workflows/pr-validate.yaml

@@ -18,7 +18,7 @@ jobs:
       addedOrModifiedCharts: ${{ steps.collect-changes.outputs.addedOrModifiedCharts }}
     steps:
       - name: Checkout
-        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
 
       - name: Collect changes
         id: collect-changes
@@ -59,7 +59,7 @@ jobs:
       pr-title: ${{ github.event.pull_request.title }}
     steps:
       - name: Get repo
-        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
         with:
           ref: ${{ github.event.pull_request.head.sha }}
       - name: verbose head git commit message