patch 8.2.1839: Vim9: memory leaks reported in assign test

Problem:    Vim9: memory leaks reported in assign test.
Solution:   Move the failing job_start() call to separate test files, it
            causes false leak reports.
diff --git a/src/version.c b/src/version.c
index 8f85e6b..f972cbd 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1839,
+/**/
     1838,
 /**/
     1837,