New version: MLJFlow v0.5.0

[JuliaRegistrator]

• Registering package: MLJFlow
• Repository: https://github.com/JuliaAI/MLJFlow.jl
• Created by: @pebeto
• Version: v0.5.0
• Commit: e692921a4b34f78f88ecb24c7515df9e107267e2
• Reviewed by: @pebeto
• Reference: Issue to trigger releases JuliaAI/MLJFlow.jl#19 (comment)
• Description: Connecting MLJ and MLFlow
• Release notes:

- **[breaking]** Renaming `_logging_channel` to `logging_channel`, and changing its type from `Channel{Tuple}` to `Union{Channel{Tuple}, Nothing}`
- **[breaking]** `open_logging_channel` function now requires a `Logger` instance and doesn't return a `Channel` anymore. The reason is to keep `logging_channel` in a "private" form in our model
- **[improvement]** Removed non-useful `wait!(result_channel)` in `src/base.jl`
- **[improvement]** Explicitly closing the `logging_channel` when a result is retrieved in the background worker

[github-actions]

Your new version pull request met all of the guidelines for auto-merging and is scheduled to be merged in the next round.

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