ci: update workflow to use GitHub artifacts for coverage instead of external services

Author: d-oit

.github/workflows/ci.yml

@@ -73,13 +73,12 @@ jobs:
 
     - name: Generate code coverage
       run: cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info
-    
-    - name: Upload coverage to Codecov
-      uses: codecov/codecov-action@v3
+    - name: Upload coverage report
+      uses: actions/upload-artifact@v4
       with:
-        files: lcov.info
-        token: ${{ secrets.CODECOV_TOKEN }}
-        fail_ci_if_error: true
+        name: coverage-report
+        path: lcov.info
+    
 
   security:
     name: Security Audit