Fix warnings in tests for push provider modules (#4398)

Author: jmartinesp

libraries/pushproviders/firebase/build.gradle.kts

@@ -73,6 +73,7 @@ dependencies {
     testImplementation(libs.test.truth)
     testImplementation(libs.test.turbine)
     testImplementation(libs.test.robolectric)
+    testImplementation(libs.kotlinx.collections.immutable)
     testImplementation(projects.libraries.matrix.test)
     testImplementation(projects.libraries.push.test)
     testImplementation(projects.libraries.pushstore.test)

libraries/pushproviders/unifiedpush/build.gradle.kts

@@ -48,6 +48,7 @@ dependencies {
     testImplementation(libs.test.robolectric)
     testImplementation(libs.test.truth)
     testImplementation(libs.test.turbine)
+    testImplementation(libs.kotlinx.collections.immutable)
     testImplementation(projects.libraries.matrix.test)
     testImplementation(projects.libraries.push.test)
     testImplementation(projects.libraries.pushproviders.test)