[liburing] bump the used wrap

Now EMPER builds using the liburing wrap succeed because they no longer include liburing/src which contains a custom syscall header.

subprojects/liburing.wrap

 [wrap-git]
 url = https://github.com/fischerling/liburing.git
-revision = 41edc386ae6a032eb745e5f4589e867f060414f0
+revision = 8efec3f04191ec4ee046e53c6d120d6c2649fa28
 depth = 1