Updates downloaders: ef5fe8d Fix: nextcloud-dl: remove sha256 file after unpacking

diff --git a/downloaders b/downloaders
index 9154e0551887ded91faa4b2b46a0db91a668e1b6..ef5fe8de0a5c0523acf547d71ae595b608233508 160000 (submodule)
--- a/downloaders
+++ b/downloaders
@@ -1 +1 @@
-Subproject commit 9154e0551887ded91faa4b2b46a0db91a668e1b6
+Subproject commit ef5fe8de0a5c0523acf547d71ae595b608233508