build: Update Codecov action to v4.0.1 with token

Author: presbrey

.github/workflows/go-test.yml

@@ -30,5 +30,7 @@ jobs:
     - name: Run tests with coverage
       run: go test -v -coverprofile=coverage.txt -covermode=atomic ./...
 
-    - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v1
+    - name: Upload coverage reports to Codecov
+      uses: codecov/[email protected]
+      with:
+        token: ${{ secrets.CODECOV_TOKEN }}