Meltano

<https://github.com/meltano/sdk/pull/3754|#3754 refactor: Make the `MetadataMapping.__getitem__` key param positional-only>
Pull request opened by <https://github.com/edgarrmondragon|edgarrmondragon>
*Summary by Sourcery*

Enhancements:
• Make `MetadataMapping` key access positional-only while preserving its existing metadata lookup behavior.
<https://github.com/meltano/sdk|meltano/sdk>

<https://github.com/meltano/sdk/pull/3754|#3754 refactor: Make the `MetadataMapping` key param positional-only>
Pull request ready for review by <https://github.com/edgarrmondragon|edgarrmondragon>
<https://github.com/meltano/sdk|meltano/sdk>

<https://github.com/meltano/sdk/pull/3754|#3754 refactor: Make the `MetadataMapping.__getitem__` key param positional-only>
Pull request merged by <https://github.com/edgarrmondragon|edgarrmondragon>
<https://github.com/meltano/sdk|meltano/sdk>