patch 8.2.2256: Vim9: cannot use function( after line break in :def function

Problem:    Vim9: cannot use function( after line break in :def function.
Solution:   Check for "(" after "function". (closes #7581)
diff --git a/src/version.c b/src/version.c
index 0ef6918..75813ed 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2256,
+/**/
     2255,
 /**/
     2254,