prometheus: update to 2.42.0

prometheus/map.jinja

 {% set prometheus = salt['grains.filter_by']({
     'default': {
-      'release': '2.40.6',
+      'release': '2.42.0',
       'alertmanager_release': '0.24.0',
       'node_exporter_release': '1.5.0',
     }