patch 8.2.1374: Vim9: error for assigning empty list to script variable

Problem:    Vim9: error for assigning empty list to script variable.
Solution:   Use t_unknown for empty list member. (closes #6595)
diff --git a/src/version.c b/src/version.c
index 7b1b8d8..abf2af0 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1374,
+/**/
     1373,
 /**/
     1372,