Update codecov/codecov-action action to v2

Author: renovate-bot

.github/workflows/go.yml

@@ -125,7 +125,7 @@ jobs:
           git --no-pager diff go.mod go.sum
           git --no-pager diff --quiet go.mod go.sum
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v1.5.0
+        uses: codecov/codecov-action@v2.0.1
         with:
           #token: ${{ secrets.CODECOV_TOKEN }}
           file: ./coverage.txt
@@ -167,7 +167,7 @@ jobs:
       - name: Run tests on Unix-like operating systems
         run: make unittest
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v1.5.0
+        uses: codecov/codecov-action@v2.0.1
         with:
           #token: ${{ secrets.CODECOV_TOKEN }}
           file: ./coverage.txt