Fix pragma check for upgradeable test (#5738)

Author: arr00

.github/workflows/checks.yml

@@ -70,8 +70,8 @@ jobs:
         run: npm run test
       - name: Check linearisation of the inheritance graph
         run: npm run test:inheritance
-      - name: Check pragma consistency between files
-        run: npm run test:pragma
+      - name: Check pragma validity
+        run: npm run test:pragma -- --concurrency 1
       - name: Check storage layout
         uses: ./.github/actions/storage-layout
         continue-on-error: ${{ contains(github.event.pull_request.labels.*.name, 'breaking change') }}