Update android gradle plugin to 3.5.1

Author: rlazo

buildSrc/build.gradle

@@ -43,7 +43,7 @@ dependencies {
     implementation 'io.opencensus:opencensus-exporter-stats-stackdriver:0.18.0'
     runtime 'io.opencensus:opencensus-impl:0.18.0'
 
-    implementation 'com.android.tools.build:gradle:3.4.1'
+    implementation 'com.android.tools.build:gradle:3.5.1'
     testImplementation 'junit:junit:4.12'
     testImplementation('org.spockframework:spock-core:1.1-groovy-2.4') {
         exclude group: 'org.codehaus.groovy'

root-project.gradle

@@ -26,7 +26,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:3.4.2'
+        classpath 'com.android.tools.build:gradle:3.5.1'
         classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.10'
         classpath 'net.ltgt.gradle:gradle-errorprone-plugin:0.7.1'
         classpath 'org.jsoup:jsoup:1.11.2'

smoke-tests/build.gradle

@@ -23,7 +23,7 @@ buildscript {
   }
 
   dependencies {
-    classpath "com.android.tools.build:gradle:3.4.2"
+    classpath "com.android.tools.build:gradle:3.5.1"
     classpath "com.google.gms:google-services:4.3.0"
   }
 }