Fix "duplicate class" errors when running ./gradlew :appcheck:firebase-appcheck-debug:deviceCheck (#6581)

Author: dconeybe

appcheck/firebase-appcheck-debug/firebase-appcheck-debug.gradle

@@ -53,6 +53,7 @@ dependencies {
     api 'com.google.firebase:firebase-annotations:16.2.0'
     api 'com.google.firebase:firebase-common:21.0.0'
     api 'com.google.firebase:firebase-components:18.0.0'
+    implementation platform(libs.kotlin.bom)
 
     implementation libs.playservices.base
     implementation libs.playservices.tasks