patch 8.2.2944: Vim9: no error when using job or channel as a string

Problem:    Vim9: no error when using job or channel as a string.
Solution:   Be more strict about conversion to string. (closes #8312)
diff --git a/src/version.c b/src/version.c
index 87bc2a0..b729c99 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2944,
+/**/
     2943,
 /**/
     2942,