patch 9.0.1539: typst filetype is not recognized

Problem:    Typst filetype is not recognized.
Solution:   Distinguish between sql and typst. (Gaetan Lepage, closes #12363)
diff --git a/src/version.c b/src/version.c
index 35a9708..5d55e4c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1539,
+/**/
     1538,
 /**/
     1537,