patch 8.2.1956: Vim9: cannot specify argument types for lambda

Problem:    Vim9: cannot specify argument types for lambda.
Solution:   Allow adding argument types.  Check arguments when calling a
            function reference.

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1956,
 /**/
     1955,
 /**/