patch 9.0.1719: if_lua: crash for for Lua functions invoked via Vim callbacks

Problem: if_lua: crash for Lua functions invoked via Vim callbacks
Solution: Use Lua registry rather than upvalues for udata cache

closes: #12785

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Jesse Pavel <jpavel@alum.mit.edu>
diff --git a/src/version.c b/src/version.c
index a1cda69..bea47fe 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1719,
+/**/
     1718,
 /**/
     1717,