chore(deps): pin actions/checkout action to 3d3c42e (#2)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://github.com/actions/checkout) | action | pinDigest |  → `3d3c42e` |

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Reviewed-on: #2
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.github/workflows/bump.yml

@@ -12,7 +12,7 @@ jobs:
   bump:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7
 
       - run: |
           echo "BUMP_DIR=$RUNNER_TEMP/bumps" >> "$GITHUB_ENV"