build.gradle: increase JVM memory settings (#145)

This fixes the issue where building in Android Studio OOMs

Fixes #10714

Signed-off-by: kari-ts <kari@tailscale.com>

android/gradle.properties

@@ -2,3 +2,4 @@ android.defaults.buildfeatures.buildconfig=true
 android.nonFinalResIds=false
 android.nonTransitiveRClass=false
 android.useAndroidX=true
+org.gradle.jvmargs=-Xmx2g -XX:MaxMetaspaceSize=512m