chore: update slack link
<a href="https://twitter.com/amundsenio">
<img src="https://img.shields.io/twitter/follow/amundsenio?label=Follow&style=social" />
</a>
- <a href="https://join.slack.com/t/amundsenworkspace/shared_invite/enQtNTk2ODQ1NDU1NDI0LTc3MzQyZmM0ZGFjNzg5MzY1MzJlZTg4YjQ4YTU0ZmMxYWU2MmVlMzhhY2MzMTc1MDg0MzRjNTA4MzRkMGE0Nzk">
+ <a href="https://join.slack.com/t/amundsenworkspace/shared_invite/zt-s8f3srsx-_0b6_WA5~eYGrv_g63L2ng">
<img src="https://img.shields.io/badge/slack-join_chat-white.svg?logo=slack&style=social" alt="Slack" />
</a>
</p>
