patch 9.0.1974: vim9: using contra-variant type-checks

Problem:  vim9: using contra-variant type-checks (after v9.0.1959)
Solution: Use invariant type checking instead

closes: #13248

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Yegappan Lakshmanan <yegappan@yahoo.com>
diff --git a/src/version.c b/src/version.c
index e93ee41..b46d20c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1974,
+/**/
     1973,
 /**/
     1972,