Revert "Aggiornati build.gradle"

This reverts commit 97bf8c291a.

# Conflicts:
#	dynamic_frudis/build.gradle
#	dynamic_ime/build.gradle
#	dynamic_saporiveri/build.gradle
#	dynamic_saporiveri_pv/build.gradle
#	dynamic_vgalimenti/build.gradle

build.gradle

@@ -13,10 +13,10 @@ buildscript {
         classpath 'com.android.tools.build:gradle:4.2.1'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath 'com.google.gms:google-services:4.3.5'
-        classpath 'com.google.firebase:perf-plugin:1.4.0'
+        classpath 'com.google.firebase:perf-plugin:1.3.5'
 
         // Add the Firebase Crashlytics Gradle plugin.
-        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.6.1'
+        classpath 'com.google.firebase:firebase-crashlytics-gradle:2.5.2'
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files