patch 8.2.0350: Vim9: expression tests don't use recognized constants

Problem:    Vim9: expression tests don't use recognized constants.
Solution:   Recognize "true" and "false" as constants.  Make skipping work for
            assignment and expression evaluation.

src/version.c

@@ -738,6 +738,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    350,
 /**/
     349,
 /**/