patch 8.2.0755: Vim9: No error when variable initializer is not a constant

Problem:    Vim9: No error when variable initializer is not a constant.
Solution:   Return FAIL when trying to get a variable value.  Do not execute a
            script when an error is deteted in the first or second phase.

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    755,
 /**/
     754,
 /**/