Disable Jest workers for debugging

Force Jest to run all tests serially to debug process hanging.

package.json

@@ -46,7 +46,7 @@
     "test:ci": "npm run test:coverage && npm run test:memory",
     "test:watch": "jest --config ./config/jest.config.js --watch",
     "test:memory": "cd scripts/memory && npm i && npm test",
-    "test:coverage": "npm run coverage -- --ci --maxWorkers=2 --reporters=default --reporters=jest-junit",
+    "test:coverage": "npm run coverage -- --ci --runInBand --reporters=default --reporters=jest-junit",
     "coverage": "jest --config ./config/jest.config.js --verbose --coverage",
     "bundlesize": "npm run build && bundlesize",
     "predeploy": "npm run build",