Upgrade Jest

This resolves an issue on Node 11.x and up.

See https://stackoverflow.com/questions/55059748/travis-jest-typeerror-cannot-assign-to-read-only-property-symbolsymbol-tostr
and jestjs/jest#8050 for details.

packages/build-support/package.json

@@ -40,8 +40,8 @@
   "devDependencies": {
     "@types/jest": "^21.1.8",
     "@types/node": "^8.0.57",
-    "jest": "^23",
-    "ts-jest": "^23.10.5",
+    "jest": "^24",
+    "ts-jest": "^24",
     "ts-node": "^3.3.0",
     "typescript": "^3.3.1"
   },

packages/client/package.json

@@ -39,7 +39,7 @@
     "enzyme": "^3.3.0",
     "enzyme-adapter-react-16": "^1.1.1",
     "identity-obj-proxy": "^3.0.0",
-    "jest": "^23",
+    "jest": "^24",
     "raf": "^3.4.0",
     "react": "^16.2.0",
     "react-dom": "^16.2.0"

packages/core/package.json

@@ -44,9 +44,9 @@
     "@types/jest": "^21.1.8",
     "@types/node": "^8.0.57",
     "@types/node-fetch": "^2.1.4",
-    "jest": "^23",
+    "jest": "^24",
     "nodemon": "^1.18.9",
-    "ts-jest": "^23.10.5",
+    "ts-jest": "^24",
     "ts-node": "^3.3.0",
     "typescript": "^3.3.1"
   },