patch 8.2.2565: Vim9: "..=" not always recognized

Problem:    Vim9: "..=" not always recognized.
Solution:   Do not consider "..=" to be string concatenation. (closes #7905)
diff --git a/src/version.c b/src/version.c
index f324143..eecbf20 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2565,
+/**/
     2564,
 /**/
     2563,