bump gradle to 6.0.1 (#27290)

Summary:
Bump Gradle to 6.0.1, which has Java 13 support and many improvements. But also it'll help us to clean up deprecation warnings.

## Changelog

[Android] [Changed] - bump Gradle to 6.0.1
Pull Request resolved: #27290

Test Plan: RNTester app builds and runs as expected

Differential Revision: D18646942

Pulled By: mdvacca

fbshipit-source-id: 3ade353446cee315447b80011d05065ad6557d2d

Author: dulmandakh

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

template/android/gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists