Bump codecov/codecov-action from 3.1.2 to 3.1.3 (#25)

Author: dependabot[bot]

.github/workflows/build.yml

@@ -39,7 +39,7 @@ jobs:
       - name: Test
         run: go test -failfast ./... -race -coverprofile=coverage.txt -covermode=atomic
       - name: Push Coverage to codecov.io
-        uses: codecov/[email protected].2
+        uses: codecov/[email protected].3
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           file: ./coverage.txt