Update contraintlayout and material libs. remove unneeded attrs.xml

Author: fat-tire

build.gradle

@@ -139,11 +139,11 @@ configurations {
 
 dependencies {
     implementation 'androidx.appcompat:appcompat:1.1.0'
-    implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta2'
+    implementation 'androidx.constraintlayout:constraintlayout:2.0.0-beta3'
     implementation 'androidx.preference:preference:1.1.0'
     implementation 'androidx.multidex:multidex:2.0.1'
     implementation 'androidx.annotation:annotation:1.1.0'
-    implementation 'com.google.android.material:material:1.1.0-beta01'
+    implementation 'com.google.android.material:material:1.2.0-alpha01'
     implementation 'com.google.code.gson:gson:2.8.6'
     implementation 'com.wdullaer:materialdatetimepicker:4.2.3'
     implementation 'com.github.guardianproject:signal-cli-android:v0.6.0-android-beta-1'