pkg/kamailio/obs: used mariadb connector instead of mysql

(cherry picked from commit ea99c8fc235334d4dd48868f74ab5c62662942e6)

pkg/kamailio/obs/kamailio.spec

@@ -761,8 +761,7 @@ BuildRequires:  zlib-devel
 Requires:   libmysqlclient18
 BuildRequires:  libmysqlclient-devel
 %else
-Requires:   mysql-libs
-BuildRequires:  mysql-devel
+BuildRequires:  mariadb-devel
 %endif
 
 %description    mysql