Downgrade R8 to fix regression (DEV) (#2003)

* Downgrade R8 to 2.0.74.

https://issuetracker.google.com/issues/176381203

* Update gradle version in unrelated task.

* Align gradle wrapper task formatting.
(No change, just formatting).

build.gradle

@@ -11,8 +11,12 @@ buildscript {
         maven {
             url "https://plugins.gradle.org/m2/"
         }
+        maven {
+            url 'https://storage.googleapis.com/r8-releases/raw'
+        }
     }
     dependencies {
+        classpath 'com.android.tools:r8:2.0.74'
         classpath 'com.android.tools.build:gradle:4.1.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath "com.google.protobuf:protobuf-gradle-plugin:$protobufVersion"
@@ -57,8 +61,6 @@ allprojects {
     repositories {
         google()
         jcenter()
-//        mavenLocal()
-
     }
 }
 
@@ -67,8 +69,8 @@ task clean(type: Delete) {
 }
 
 wrapper {
-    gradleVersion = "6.1.1"
-    distributionType = "all"
+    gradleVersion = "6.7.1"
+    distributionType = "bin"
 }
 
 task quickBuild {

gradle/wrapper/gradle-wrapper.properties

-#Wed Dec 23 12:59:24 CET 2020
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.7.1-bin.zip