github action: update codecov version

Author: JohannesKaufmann

.github/workflows/go.yml

@@ -37,7 +37,7 @@ jobs:
       run: go test -v -race -coverprofile=coverage.txt -covermode=atomic .
 
     - name: Upload Coverage report to CodeCov
-      uses: codecov/codecov-action@v1.0.0
+      uses: codecov/codecov-action@v2
       with:
         token: ${{secrets.CODECOV_TOKEN}}
         file: ./coverage.txt