patch 9.0.1548: CI: check in sound-dummy module may throw an error

Problem:    CI: check in sound-dummy module may throw an error.
Solution:   Check whether apt-cache can show the package description.
            (Christian Brabandt, closes #12390)
diff --git a/src/version.c b/src/version.c
index 20a6e99..a3c9453 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1548,
+/**/
     1547,
 /**/
     1546,