gha: bump actions/checkout from 3 to 4 (#25)

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.github/workflows/check.yml

@@ -18,7 +18,7 @@ jobs:
         id: go
 
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Lint
         run: make lint