patch 8.2.0975: Vim9: script variable does not accept optional s: prefix

Problem:    Vim9: script variable does not accept optional s: prefix.
Solution:   Adjust the accepted syntax.
diff --git a/src/version.c b/src/version.c
index 1f91903..e9a0723 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    975,
+/**/
     974,
 /**/
     973,