chore(deps): bump appcompat in /tutorials/kotlin/Polygons (googlemaps-samples#270)

Author: dependabot-preview[bot]

tutorials/kotlin/Polygons/app/build.gradle

@@ -35,7 +35,7 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
     implementation 'com.google.android.gms:play-services-maps:17.0.0'
     testImplementation 'junit:junit:4.13'
     androidTestImplementation 'androidx.test.ext:junit:1.1.1'