Bump core from 1.3.0 to 1.4.0 (#2558)

Summary:
Bumps core from 1.3.0 to 1.4.0.

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Pull Request resolved: https://github.com/facebook/flipper/pull/2558

Reviewed By: timur-valiev

Differential Revision: D29993014

Pulled By: passy

fbshipit-source-id: 1725a4f44d44e81ed22700990646d5202f030a75

build.gradle

@@ -98,7 +98,7 @@ ext.deps = [
         leakcanary         : 'com.squareup.leakcanary:leakcanary-android:1.6.3',
         leakcanary2        : 'com.squareup.leakcanary:leakcanary-android:2.6',
         protobuf           : 'com.google.protobuf:protobuf-java:3.17.3',
-        testCore           : 'androidx.test:core:1.3.0',
+        testCore           : 'androidx.test:core:1.4.0',
         testRules          : 'androidx.test:rules:1.3.0',
         // Plugin dependencies
         frescoFlipper      : 'com.facebook.fresco:flipper:2.5.0',