update conduct email address

motivation: use correct email address for conduct issues

changes: make sure email address is `[email protected]` everywhere

Author: tomerd

CODE_OF_CONDUCT.md

@@ -41,7 +41,7 @@ This code of conduct applies both within project spaces and in public spaces whe
 individual is representing the project or its community.
 
 Instances of abusive, harassing, or otherwise unacceptable behavior may be reported by
-contacting a project maintainer at [swift-metrics[email protected]](mailto:swift-metrics[email protected]). All complaints will be reviewed and
+contacting a project maintainer at [swift-server[email protected]](mailto:swift-server[email protected]). All complaints will be reviewed and
 investigated and will result in a response that is deemed necessary and appropriate to the
 circumstances. Maintainers are obligated to maintain confidentiality with regard to the reporter
 of an incident.