Add NewApi suppressions.

app/src/main/java/com/github/libretube/helpers/DownloadHelper.kt

@@ -35,6 +35,7 @@ object DownloadHelper {
     }
 
     fun getDownloadDir(context: Context, path: String): Path {
+        @Suppress("NewApi") // The Path class is desugared.
         return getOfflineStorageDir(context).resolve(path).createDirectories()
     }
 

app/src/main/java/com/github/libretube/services/DownloadService.kt

@@ -442,6 +442,7 @@ class DownloadService : LifecycleService() {
      * Get a [File] from the corresponding download directory and the file name
      */
     private fun getDownloadPath(directory: String, fileName: String): Path {
+        @Suppress("NewApi") // The Path class is desugared.
         return DownloadHelper.getDownloadDir(this, directory).resolve(fileName)
     }