Modernize UART interrupts

[bugadani]

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Submission Checklist 📝

• [x] I have updated existing examples or added new ones (if applicable).
• [x] I have used cargo xtask fmt-packages command to ensure that all changed code is formatted correctly.
• [x] My changes were added to the CHANGELOG.md in the proper section.
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Pull Request Details 📖

Description

Chipping away at the present state of inconsistency.