ci: set workspace-concurrency to 2

package.json

@@ -26,9 +26,9 @@
     "test": "vitest --api -r test/core",
     "test:run": "vitest run -r test/core",
     "test:all": "CI=true pnpm -r --stream run test --allowOnly",
-    "test:ci": "CI=true pnpm -r --reporter-hide-prefix --stream --filter !test-browser --filter !test-esm --filter !test-browser run test --allowOnly",
-    "test:ci:vm-threads": "CI=true pnpm -r --reporter-hide-prefix --stream --filter !test-coverage --filter !test-single-thread --filter !test-browser --filter !test-esm --filter !test-network-imports --filter !test-browser --filter !example-react-testing-lib-msw run test --allowOnly --pool vmThreads",
-    "test:ci:no-threads": "CI=true pnpm -r --reporter-hide-prefix --stream --filter !test-vm-threads --filter !test-coverage --filter !test-watch --filter !test-bail --filter !test-esm --filter !test-browser run test --allowOnly --pool forks",
+    "test:ci": "CI=true pnpm -r --workspace-concurrency=2 --reporter-hide-prefix --stream --filter !test-browser --filter !test-esm --filter !test-browser run test --allowOnly",
+    "test:ci:vm-threads": "CI=true pnpm -r --workspace-concurrency=2 --reporter-hide-prefix --stream --filter !test-coverage --filter !test-single-thread --filter !test-browser --filter !test-esm --filter !test-network-imports --filter !test-browser --filter !example-react-testing-lib-msw run test --allowOnly --pool vmThreads",
+    "test:ci:no-threads": "CI=true pnpm -r --workspace-concurrency=2 --reporter-hide-prefix --stream --filter !test-vm-threads --filter !test-coverage --filter !test-watch --filter !test-bail --filter !test-esm --filter !test-browser run test --allowOnly --pool forks",
     "typecheck": "tsc -p tsconfig.check.json --noEmit",
     "typecheck:why": "tsc -p tsconfig.check.json --noEmit --explainFiles > explainTypes.txt",
     "ui:build": "vite build packages/ui",