patch 8.2.2000: Vim9: dict.key assignment not implemented yet

Problem:    Vim9: dict.key assignment not implemented yet.
Solution:   Implement dict.key assignment. (closes #7312)
diff --git a/src/version.c b/src/version.c
index ec1abe6..a988b21 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2000,
+/**/
     1999,
 /**/
     1998,