ci: standardize code coverage artifact naming

Author: dmtrshat

.github/workflows/ci.yml

@@ -32,7 +32,7 @@ jobs:
             - name: Archive code coverage results
               uses: actions/upload-artifact@v4
               with:
-                  name: code-coverage-${{ matrix.node-version }}
+                  name: code-coverage
                   path: |
                       src/statemanjs/coverage/lcov.info
                       src/statemanjs-react/coverage/lcov.info
@@ -46,8 +46,7 @@ jobs:
             - name: Download code coverage results
               uses: actions/download-artifact@v4
               with:
-                  pattern: code-coverage-*
-                  merge-multiple: true
+                  name: code-coverage
 
             - name: Upload coverage reports to Codecov - statemanjs
               uses: codecov/codecov-action@v3