votequorum: bump soname

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Christine Caulfield <ccaulfie@redhat.com>
Reviewed-by: Jan Friesse <jfriesse@redhat.com>

lib/libvotequorum.verso

@@ -1 +1 @@
-5.0.0
+6.0.0