Unleashclient

* (Minor) Switch back to mmh3 for Python 3.12 support.

* (Bugfix) Metrics counting for dependent feature flags (the previous implementation was incorrect) ([300](https://github.com/Unleash/unleash-client-python/pull/300) and [#304](https://github.com/Unleash/unleash-client-python/pull/304))

* (Minor) Add missing parenthesis
* (Bugfix) Fix/double execution result
* (Documentation) Update readme with developer instructions

* (Minor) Configurable timeout and retries

* (Minor) Typos in request timeout
* (Minor) Bump client spec

* (Minor) add is_feature_enabled to variant response