Bump codecov/codecov-action from 3.0.0 to 3.1.0 (#535)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3.0.0 to 3.1.0.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-action@e3c5604...81cd2dc)

---
updated-dependencies:
- dependency-name: codecov/codecov-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/main.yml

@@ -43,6 +43,6 @@ jobs:
       - name: Test
         run: go test -v -coverprofile=coverage.txt -covermode=atomic ./...
       - name: Upload Coverage Report
-        uses: codecov/codecov-action@e3c560433a6cc60aec8812599b7844a7b4fa0d71 # v3.0.0
+        uses: codecov/codecov-action@81cd2dc8148241f03f5839d295e000b8f761e378 # v3.0.0
       - name: Ensure no files were modified as a result of the build
         run: git update-index --refresh && git diff-index --quiet -I"^\/\/\s+protoc(-gen-go)?\s+v[0-9]+\.[0-9]+\.[0-9]+$" HEAD -- || git diff -I"^\/\/\s+protoc(-gen-go)?\s+v[0-9]+\.[0-9]+\.[0-9]+$" --exit-code