Bump codecov/codecov-action from 3 to 4

Bumps [codecov/codecov-action](https://github.com/codecov/codecov-action) from 3 to 4.
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@v3...v4)

---
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>

Author: dependabot[bot]

.github/workflows/test-go-task.yml

@@ -94,7 +94,7 @@ jobs:
 
       - name: Send unit tests coverage to Codecov
         if: runner.os == 'Linux' && github.repository == 'arduino/pluggable-discovery-protocol-handler'
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           # A token is used to avoid intermittent spurious job failures caused by rate limiting.
           token: d2497f03-291d-4e0c-9d31-d94614ed7c16
@@ -104,7 +104,7 @@ jobs:
 
       - name: Send unit tests coverage to Codecov (run from a fork)
         if: runner.os == 'Linux' && github.repository != 'arduino/pluggable-discovery-protocol-handler'
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           # use repository variable CODECOV_TOKEN if running from a fork.
           # codecov/codecov-action does unauthenticated upload if empty string is passed via the `token` input.