fix(throttling): use Octokit's plugin-throttling instead of a custom implementation

[oscard0m]

📓 Description

Use Octokit's throttling plugin instead of implementing a custom implementation.

❓ Unknowns

• Do we want to get rid of all custom logic and rely on the settings offered by default by Octokit's plugin-throttling?
• Do we want to provide new options so the users of semantic-release can tweak the configuration of this plugin?

🔌 Context

The idea is to fix current throttling problems and rely on Octokit's plugin for future throttling options that could occur.

• Fixes #299
• Causes https://github.com/semantic-release/semantic-release/issues/2204