patch 9.0.2007: Vim9: covariant parameter types allowed

Problem:  Vim9: covariant parameter types allowed when assigning
          functions
Solution: Enforce invariant type check for arguments and return value
          when assigning a funcref

closes: #13299
closes: #13305

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 08c34e1..489ecb8 100644
--- a/src/version.c
+++ b/src/version.c
@@ -705,6 +705,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2007,
+/**/
     2006,
 /**/
     2005,