chore(deps): 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] <[email protected]>

.github/workflows/ci.yaml

@@ -194,7 +194,7 @@ jobs:
         # We can't just set to 0 or "" as the SGX code looks for it being set, not what the value is :(
         # The FFI bindings crates always report 100% because they have no code
         run: unset SGX_AESM_ADDR && cargo llvm-cov --locked --features sim --ignore-filename-regex '\/sys/src/lib\.rs' --workspace --lcov --output-path lcov.info
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
           files: lcov.info