patch 8.2.2982: Vim9: future commands are not reserved yet

Problem:    Vim9: future commands are not reserved yet.
Solution:   Add commands to be implemented later.  Make "this" a reserved
            name.
diff --git a/src/version.c b/src/version.c
index 15ee76a..17ae9a4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2982,
+/**/
     2981,
 /**/
     2980,