Upgrade to Gradle 7 (#2279)

Summary:
Depends on https://github.com/facebook/flipper/issues/2277. Fixes https://github.com/facebook/flipper/issues/2221.

The maven plugin is no longer exposed and implied by https://developer.android.com/studio/build/maven-publish-plugin.

Pull Request resolved: https://github.com/facebook/flipper/pull/2279

Test Plan: ./gradlew uploadArchives -PdryRun=true

Reviewed By: priteshrnandgaonkar

Differential Revision: D28473692

Pulled By: passy

fbshipit-source-id: 3d95122fecebfeac8bfa5173c5c633eee3f13311

android/plugins/fresco/build.gradle

@@ -6,7 +6,6 @@
  */
 
 apply plugin: 'com.android.library'
-apply plugin: 'maven'
 
 android {
     compileSdkVersion rootProject.compileSdkVersion

android/plugins/leakcanary/build.gradle

@@ -6,7 +6,6 @@
  */
 
 apply plugin: 'com.android.library'
-apply plugin: 'maven'
 
 android {
     compileSdkVersion rootProject.compileSdkVersion

android/plugins/leakcanary2/build.gradle

@@ -9,7 +9,6 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 apply plugin: 'kotlin-kapt'
-apply plugin: 'maven'
 
 android {
     compileSdkVersion rootProject.compileSdkVersion

android/plugins/litho/build.gradle

@@ -6,7 +6,6 @@
  */
 
 apply plugin: 'com.android.library'
-apply plugin: 'maven'
 
 android {
     compileSdkVersion rootProject.compileSdkVersion

android/plugins/network/build.gradle

@@ -6,7 +6,6 @@
  */
 
 apply plugin: 'com.android.library'
-apply plugin: 'maven'
 
 android {
     compileSdkVersion rootProject.compileSdkVersion

android/plugins/retrofit2-protobuf/build.gradle

@@ -9,7 +9,6 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
 apply plugin: 'kotlin-kapt'
-apply plugin: 'maven'
 
 android {
     compileSdkVersion rootProject.compileSdkVersion