patch 8.2.1351: Vim9: no proper error if using namespace for nested function

Problem:    Vim9: no proper error if using namespace for nested function.
Solution:   Specifically check for a namespace. (closes #6582)
diff --git a/src/version.c b/src/version.c
index 00d8c2d..f032581 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1351,
+/**/
     1350,
 /**/
     1349,