patch 8.2.1201: Vim9: crash when passing number as dict key

Problem:    Vim9: crash when passing number as dict key.
Solution:   Check key type to be string. (closes #6449)
diff --git a/src/version.c b/src/version.c
index 87eda28..2c9c4f0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1201,
+/**/
     1200,
 /**/
     1199,