Revert com.mebigfatguy.fb-contrib:fb-contrib to 7.6.0

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

app/build.gradle

@@ -291,7 +291,7 @@ dependencies {
     qaImplementation project(':appscan')
 
     spotbugsPlugins 'com.h3xstream.findsecbugs:findsecbugs-plugin:1.12.0'
-    spotbugsPlugins 'com.mebigfatguy.fb-contrib:fb-contrib:7.6.4'
+    spotbugsPlugins 'com.mebigfatguy.fb-contrib:fb-contrib:7.6.0'
 
     implementation "com.google.dagger:dagger:$daggerVersion"
     implementation "com.google.dagger:dagger-android:$daggerVersion"