Close #8232: Remove firebase-core dependency from lib-push-firebase

buildSrc/src/main/java/Dependencies.kt

@@ -156,6 +156,5 @@ object Dependencies {
     const val thirdparty_jna = "net.java.dev.jna:jna:${Versions.jna}@jar"
     const val thirdparty_disklrucache = "com.jakewharton:disklrucache:${Versions.disklrucache}"
 
-    const val firebase_core = "com.google.firebase:firebase-core:${Versions.Firebase.core}"
     const val firebase_messaging = "com.google.firebase:firebase-messaging:${Versions.Firebase.messaging}"
 }

components/lib/push-firebase/build.gradle

@@ -28,7 +28,6 @@ dependencies {
     implementation project(':concept-push')
     implementation project(':support-base')
 
-    implementation Dependencies.firebase_core
     api Dependencies.firebase_messaging
 
     testImplementation project(':support-test')

docs/changelog.md

@@ -24,6 +24,9 @@ permalink: /changelog/
   * Implements TopSitesFeature based on the RFC [0006-top-sites-feature.md](https://github.com/mozilla-mobile/android-components/blob/master/docs/rfcs/0006-top-sites-feature.md).
   * Downloads, redirect targets, reloads, embedded resources, and frames are no longer considered for inclusion in top sites. Please see [this Application Services PR](https://github.com/mozilla/application-services/pull/3505) for more details.
 
+* **lib-push-firebase**
+  * Removed non-essential dependency on `com.google.firebase:firebase-core`.
+
 # 56.0.0
 
 * [Commits](https://github.com/mozilla-mobile/android-components/compare/v55.0.0...v56.0.0)