deps: Upgrade jest-expo to 42.1.0, the latest.

This gets us expo/expo#12735, which lets us use Jest 26, instead of
25, without the `resolutions` hack we added in f1b59fe. So, remove
that hack.

package.json

@@ -113,7 +113,7 @@
     "jest-cli": "^26.4.1",
     "jest-environment-jsdom": "^26.3.0",
     "jest-environment-jsdom-global": "^2.0.4",
-    "jest-expo": "^40.0.1",
+    "jest-expo": "^42.1.0",
     "jest-extended": "^0.11.5",
     "jetifier": "^2.0.0",
     "metro-react-native-babel-preset": "^0.64.0",
@@ -127,8 +127,5 @@
     "rollup": "^2.26.5",
     "typescript": "~3.8.3",
     "yarn-deduplicate": "^3.0.0"
-  },
-  "resolutions": {
-    "jest-expo/jest": "^26.4.1"
   }
 }