add SUMO to list of eligible sites for bug bounty (#11267)

* add SUMO to list of eligible sites for bug bounty

* Update bedrock/security/templates/security/bug-bounty/web-eligible-sites.html

* fix message for sumo

Co-authored-by: Craig Cook <craigcook@users.noreply.github.com>

Co-authored-by: Steve Jalim <steve@stevejalim.net>
Co-authored-by: Craig Cook <craigcook@users.noreply.github.com>

bedrock/security/templates/security/bug-bounty/web-eligible-sites.html

@@ -254,4 +254,12 @@
     <li>vpn.mozilla.org</li>
   </ul>
 
+  <h3>Support</h3>
+  <ul class="mzp-u-list-styled">
+    <li>support.mozilla.org</li>
+  </ul>
+  <p>
+    Please use our <a href="https://support.allizom.org">staging instance</a> for testing to avoid disrupting users.
+  </p>
+
 {% endblock %}