Update Slack join link

Author: jondricek

modules/resources/templates/contact.html

@@ -27,7 +27,7 @@ <h1>Stay Informed</h1>
             <div class="card-deck mt-4">
                 {{contact_card.render("Twitter", "https://twitter.com/MITREattack", "Follow us @MITREattack to hear about news, latest updates, and what community members are doing with ATT&CK.", "fa-brands fa-x-twitter", invert_icon=True)}}
                 {{contact_card.render("Medium", "https://medium.com/mitre-attack", "Check out our Medium blog for ATT&CK updates and information.", "fa-brands fa-medium", invert_icon=True)}}
-                {{contact_card.render("Slack", "https://join.slack.com/t/mitreattack/shared_invite/zt-ny1a3yon-XkT_OS1IF~ZYrESq8Xtqjg", "Join the ATT&CK slack workspace! With over 3,000 members and 15 channels, find and start discussions with the community on all things ATT&CK.", "fa-brands fa-slack", invert_icon=True)}}
+                {{contact_card.render("Slack", "https://join.slack.com/t/mitreattack/shared_invite/zt-31qd9wq8x-ppOoFylJV6kcp8vAsGM9wg", "Join the ATT&CK slack workspace! With over 3,000 members and 15 channels, find and start discussions with the community on all things ATT&CK.", "fa-brands fa-slack", invert_icon=True)}}
             </div>
         </div>
         <div class="my-5">