update slack link (#422)

Author: goelsonali

_config.yml

@@ -23,7 +23,7 @@ gtagId: "G-3V6VPT445S"
 
 network:
   linkedin: https://www.linkedin.com/company/womencodingcommunity
-  slack: https://join.slack.com/t/womencodingcommunity/shared_invite/zt-2hpjwpx7l-rgceYBIWp6pCiwc0hVsX8A
+  slack: https://join.slack.com/t/womencodingcommunity/shared_invite/zt-31h8amjsg-zojz1nO3YMpzab8MJUFxEA
   github: https://github.com/Women-Coding-Community
   meetup: https://www.meetup.com/women-coding-community/
   instagram: https://www.instagram.com/women_coding_community