patch 8.2.0343: Vim9: using wrong instruction, limited test coverage

Problem:    Vim9: using wrong instruction, limited test coverage.
Solution:   Use ISN_PUSHJOB.  Add a few more tests.
diff --git a/src/version.c b/src/version.c
index 6ecd281..56a0aee 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    343,
+/**/
     342,
 /**/
     341,