patch 9.0.1553: CI: using slightly outdated gcc version

Problem:    CI: using slightly outdated gcc version.
Solution:   Use "brew" to get a more recent gcc version.  (closes #12391)
diff --git a/src/version.c b/src/version.c
index 2f2fa12..ed51a81 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1553,
+/**/
     1552,
 /**/
     1551,