v2.9.0rc1

Features

• Replace pyenv in favor of poetry #237

Fixes

• Update Pyms dependencies,
• Fix issue "KeyError: 'WERKZEUG_SERVER_FD'" #241 (PR #246)
• Fix issue "KeyError: 'APP_NAME'," #242 (PR #246)
• Integrate last version of Connexion
• Deprecate opentracing
• Deprecate jaeger_client
• Depreacte prometheus