do not use internal class

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

Author: tobiasKaminsky

library/src/main/java/com/owncloud/android/lib/resources/tags/PutTagRemoteOperation.kt

@@ -12,16 +12,14 @@ import com.nextcloud.operations.PutMethod
 import com.owncloud.android.lib.common.operations.RemoteOperation
 import com.owncloud.android.lib.common.operations.RemoteOperationResult
 import okhttp3.RequestBody
-import okhttp3.RequestBody.Companion.toRequestBody
-import okhttp3.internal.EMPTY_BYTE_ARRAY
 import org.apache.commons.httpclient.HttpStatus
 
 class PutTagRemoteOperation(
     val id: String,
     val fileId: Long
 ) : RemoteOperation<Void>() {
     override fun run(client: NextcloudClient): RemoteOperationResult<Void> {
-        val empty: RequestBody = EMPTY_BYTE_ARRAY.toRequestBody()
+        val empty: RequestBody = RequestBody.EMPTY
         val putMethod =
             PutMethod(
                 client.baseUri.toString() + TAG_URL + fileId + "/" + id,