patch 8.2.0811: terminal keycode test is flaky

Problem:    Terminal keycode test is flaky.
Solution:   Use WaitForAssert()
diff --git a/src/version.c b/src/version.c
index 9e8ba92..3bd0ec4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    811,
+/**/
     810,
 /**/
     809,