ci/cd: update llvm-cov features build

Author: wilhelmagren

.github/workflows/tests.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Install cargo-llvm-cov
         uses: taiki-e/install-action@cargo-llvm-cov
       - name: Generate coverage report
-        run: cargo llvm-cov --features rayon --workspace --lcov --output-path lcov.info
+        run: cargo llvm-cov --features mock --workspace --lcov --output-path lcov.info
       - name: Upload coverage report
         uses: codecov/codecov-action@v4
         with: