remove unused updateTopics method

core/database/src/main/java/com/google/samples/apps/nowinandroid/core/database/dao/TopicDao.kt

@@ -20,7 +20,6 @@ import androidx.room.Dao
 import androidx.room.Insert
 import androidx.room.OnConflictStrategy
 import androidx.room.Query
-import androidx.room.Update
 import androidx.room.Upsert
 import com.google.samples.apps.nowinandroid.core.database.model.TopicEntity
 import kotlinx.coroutines.flow.Flow
@@ -55,12 +54,6 @@ interface TopicDao {
     @Insert(onConflict = OnConflictStrategy.IGNORE)
     suspend fun insertOrIgnoreTopics(topicEntities: List<TopicEntity>): List<Long>
 
-    /**
-     * Updates [entities] in the db that match the primary key, and no-ops if they don't
-     */
-    @Update
-    suspend fun updateTopics(entities: List<TopicEntity>)
-
     /**
      * Inserts or updates [entities] in the db under the specified primary keys
      */