patch 8.2.2180: Vim9: test for error after error is flaky

Problem:    Vim9: test for error after error is flaky.
Solution:   Wait for job to finish instead of a fixed delay.
diff --git a/src/version.c b/src/version.c
index 9e1327d..07edd0c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2180,
+/**/
     2179,
 /**/
     2178,