Update dependency jest to v26

Author: renovate-bot

package.json

@@ -60,7 +60,7 @@
     "flow-bin": "^0.106.0",
     "flow-copy-source": "^2.0.8",
     "flow-remove-types": "^2.105.2",
-    "jest": "^24.9.0",
+    "jest": "^26.0.0",
     "jest-flow-transform": "^1.0.1",
     "jest-sandbox": "^1.1.2",
     "prettier": "^1.18.2"