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>

.github/workflows/rust.yml

@@ -133,7 +133,7 @@ jobs:
         run: |
           RUST_LOG=warn cargo tarpaulin --workspace --timeout 120 --out xml --features testx --skip-clean --target-dir=target/coverage
       - name: Upload to codecov.io
-        uses: codecov/codecov-action@v3 # Make sure to use v3 because it allows tokenless upload
+        uses: codecov/codecov-action@v4 # Make sure to use v3 because it allows tokenless upload
 
   deploy_docs:
     needs: [build, test]