[chore] Fixed the "Getting In touch" URL (#13533)

* Fixed the "Getting In touch" URL

* Updated "Getting In touch" link with slack channel

* Create fix-broken-link.yaml

updating changelog

* Delete fix-broken-link.yaml

removed entry in changelog

README.md

@@ -6,7 +6,7 @@
    •  
  <a href="https://github.com/open-telemetry/opentelemetry-collector/blob/main/CONTRIBUTING.md">Getting Involved</a>
  &nbsp;&nbsp;&bull;&nbsp;&nbsp;
- <a href="https://gitter.im/open-telemetry/opentelemetry-service">Getting In Touch</a>
+ <a href="https://cloud-native.slack.com/archives/C01N6P7KR6W">Getting In Touch</a>
  </strong>
 </p>