Update branch on magisk-prebuilt repo

twrp-extras.xml

@@ -9,7 +9,7 @@
     <project path="bootable/recovery" name="android_bootable_recovery" remote="TeamWin" revision="android-9.0"/>
 
 <!-- Include external Magisk repo for repack binaries -->
-    <project path="external/magisk-prebuilt" name="external_magisk-prebuilt" remote="TeamWin" revision="master" />
+    <project path="external/magisk-prebuilt" name="external_magisk-prebuilt" remote="TeamWin" revision="android-9.0" />
 	
 <!-- Include TeamWin android_system_update_engine to build a good update_engine_sideload -->
     <project path="system/update_engine" name="android_system_update_engine" remote="TeamWin" revision="android-9.0" />