fix: Remove --maxWorkers flag (conflicts with --runInBand)

- Jest doesn't allow both flags together
- --runInBand alone runs tests serially

Author: michaeloboyle

.github/workflows/ci.yml

@@ -32,10 +32,10 @@ jobs:
       run: npm run build
 
     - name: Run tests
-      run: npm test -- --runInBand --maxWorkers=1
+      run: npm test -- --runInBand
 
     - name: Check test coverage
-      run: npm run test:coverage -- --runInBand --maxWorkers=1
+      run: npm run test:coverage -- --runInBand
 
     - name: Upload coverage to Codecov
       if: matrix.node-version == '20.x'