Bump codecov/codecov-action from 3.1.5 to 3.1.6

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3.1.5 to 3.1.6.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@4fe8c5f...ab904c4)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/main.yml

@@ -51,7 +51,7 @@ jobs:
 
             - name: Upload coverage report
               if: ${{ matrix.platform.os == 'iOS' }}
-              uses: codecov/codecov-action@4fe8c5f003fae66aa5ebb77cfd3e7bfbbda0b6b0
+              uses: codecov/codecov-action@ab904c41d6ece82784817410c45d8b8c02684457
 
     test-package:
         name: Test Swift package using Xcode ${{ matrix.xcode }}