build(deps): bump codecov/codecov-action from 2.1.0 to 3 (#1584)

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 2.1.0 to 3.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/master/CHANGELOG.md)
- [Commits](codecov/codecov-action@f32b3a3...e3c5604)

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

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

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

.github/workflows/coverage.yml

@@ -42,4 +42,4 @@ jobs:
       #- run: cargo tarpaulin --locked --workspace --exclude=linkerd2-proxy --exclude=linkerd-app-integration --skip-clean --ignore-tests --no-fail-fast --out=Xml
       - run: cargo tarpaulin --locked --packages=linkerd-app-integration --no-default-features --skip-clean --no-run
       - run: cargo tarpaulin --locked --packages=linkerd-app-integration --no-default-features --skip-clean --ignore-tests --no-fail-fast --out=Xml
-      - uses: codecov/codecov-action@f32b3a3741e1053eb607407145bc9619351dc93b
+      - uses: codecov/codecov-action@e3c560433a6cc60aec8812599b7844a7b4fa0d71