chore(deps): update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/codecov.yml

@@ -11,7 +11,7 @@ jobs:
           go-version: 1.17
 
       - name: Check out code into the Go module directory
-        uses: actions/checkout@v1
+        uses: actions/checkout@3df4ab11eba7bda6032a0b82a6bb43b11571feac # v4
 
       - name: Get dependencies
         run: |