Update Gradle wrapper to 6.1 (#27800)

Summary:
```
Welcome to Gradle 6.1!

Here are the highlights of this release:
 - Dependency cache is relocatable
 - Configurable compilation order between Groovy, Java & Scala
 - New sample projects in Gradle's documentation

For more details see https://docs.gradle.org/6.1/release-notes.html
```

## Changelog

[Android] [Changed] - Update Gradle wrapper to 6.1
Pull Request resolved: #27800

Test Plan: Build project

Differential Revision: D19460735

Pulled By: mdvacca

fbshipit-source-id: b5e71cf97c0208947d6e524a74907b74f6a71c8d

Author: friederbluemle

gradle/wrapper/gradle-wrapper.jar

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.0.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.1-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists