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.
diff --git a/src/version.c b/src/version.c
index 8ff5161..1f77ddc 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    755,
+/**/
     754,
 /**/
     753,