patch 8.2.0306: Vim9: :substitute(pat(repl does not work in Vim9 script

Problem:    Vim9: :substitute(pat(repl does not work in Vim9 script.
Solution:   Remember starting with a colon. (closes #5676)
diff --git a/src/version.c b/src/version.c
index 2c4f78b..49cdcc5 100644
--- a/src/version.c
+++ b/src/version.c
@@ -739,6 +739,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    306,
+/**/
     305,
 /**/
     304,