refactor: remove calls to deprecated endpoints

[Thomas-Heniart]

Description

Remove calls to deprecated endpoints

Related Issue

https://app.asana.com/1/29923630752984/project/1201889891323175/task/1211100285536396?focus=true

Type of change

• Bug fix (non-breaking change which fixes an issue);
• New feature (non-breaking change which adds functionality);
• Breaking change (fix or feature that would cause existing functionality to not work as expected);
• This change requires a documentation update;

Checklist:

• I've done a self-review of my code;
• I've made corresponding changes to the documentation;
• I've made sure my changes generate no warnings;
• mypy returns no errors when run on the root package;
• I've run black to format my code;
• I've run isort to format my code's import statements;
• flake8 reports no errors when run on the entire code base;

[acamaragl]

hmm, I think you can remove all the pulse references, can't you?

[vigan-abd]

need also major release https://github.com/bitfinexcom/bitfinex-api-py/blob/master/setup.py#L5