chore(ci): remove pact_broker client gem-released trigger

[YOU54F]

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pact_broker-client, has a workflow for gem-released

This triggers a doc update in docs.pact.io

I believe this isnt required as

• not in deps or listed in rubygems

Apart from X_PACT_DEVELOPMENT

Which should be updated to include pact which does in turn rely on pact-mock_service

And the docs from this readme are not currently synced to the docs.pact.io site