fix: Update appcompat to avoid "OnClickXmlDetector called context.getMainProject()" lint error (#974)

Closes #973

Author: barbeau

demo/build.gradle

@@ -64,7 +64,7 @@ dependencies {
 
     // [START_EXCLUDE silent]
     // implementation project(':library')
-    implementation 'androidx.appcompat:appcompat:1.3.1'
+    implementation 'androidx.appcompat:appcompat:1.4.0-alpha03'
     implementation 'androidx.lifecycle:lifecycle-extensions:2.2.0'
 
     // GMS