⬆️ Update async-trait to v0.1.81

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
async-trait	dependencies	patch	0.1.80 -> 0.1.81

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Release Notes

dtolnay/async-trait (async-trait)

### [`v0.1.81`](https://togithub.com/dtolnay/async-trait/releases/tag/0.1.81) [Compare Source](https://togithub.com/dtolnay/async-trait/compare/0.1.80...0.1.81) - Turn off unneeded features of `syn` dependency ([#​272](https://togithub.com/dtolnay/async-trait/issues/272), thanks [@​klensy](https://togithub.com/klensy))

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