security/py-service[_-]identity: remove duplicate clashing ports

[girgen]

Summary

security/py-service[_-]identity: remove duplicate clashing ports

The port was renamed upstreams to use a hyphen in the name instead of an
underscore. A duplicate port was introduced into the ports tree and they
clash since they install the same file. Python does not distinguish
between _ and - in package names.

PR: 275167

[vishwin]

Looks like @sunpoet has taken the bug so they will handle the commit, with maintainer of the service_identity port approving.

Note that Python name normalisation rules regard all of hyphen (-), low line (_) and full stop (.) as equivalent and normalised to hyphen (-). However, for wheel filenames, they are instead normalised to low line (_).

[vishwin]

Also don't forget to add a MOVED entry.