Downgrade Jest to 26 to fix error

Fixes warning when running tests "TypeError: Cannot destructure property 'config' of 'options' as it is undefined"

See callstack/react-native-testing-library#743

package.json

@@ -46,12 +46,12 @@
     "@react-native-community/eslint-config": "^3.0.1",
     "@testing-library/jest-native": "^4.0.4",
     "@testing-library/react-native": "^9.0.0",
-    "babel-jest": "^27.4.6",
+    "babel-jest": "^26.6.3",
     "cypress": "^9.4.1",
     "eslint": "^7.32.0",
     "eslint-plugin-cypress": "^2.12.1",
     "eslint-plugin-import": "~2.25.4",
-    "jest": "^27.4.7",
+    "jest": "^26.6.3",
     "jest-expo": "^44.0.0",
     "react-test-renderer": "^17.0.2"
   },