patch 8.2.0508: Vim9: func and partial types not done yet

Problem:    Vim9: func and partial types not done yet
Solution:   Fill in details about func declaration, drop a separate partial
            declaration.

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    508,
 /**/
     507,
 /**/