patch 8.2.3506: Vim9: special cases for "g" and "s" insufficiently tested

Problem:    Vim9: special cases for "g" and "s" insufficiently tested.
Solution:   Add a few more test cases.
diff --git a/src/version.c b/src/version.c
index 7fa96b0..a4a2363 100644
--- a/src/version.c
+++ b/src/version.c
@@ -758,6 +758,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    3506,
+/**/
     3505,
 /**/
     3504,