patch 8.2.0757: Vim9: no test for MEMBER instruction

Problem:    Vim9: no test for MEMBER instruction.
Solution:   Add a test.  Make matches stricter.
diff --git a/src/version.c b/src/version.c
index 44f816a..0618447 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    757,
+/**/
     756,
 /**/
     755,