Update Rust crate async-trait to v0.1.91

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
async-trait	dependencies	patch	0.1.80 → 0.1.91

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Release Notes

dtolnay/async-trait (async-trait)

v0.1.91

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v0.1.90

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• Update to syn 3

v0.1.89

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• Improve IDE functionality (#​293, thanks @​Veykril)

v0.1.88

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• Fix lifetime bounding on generic parameters that have cfg (#​289)

v0.1.87

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• Documentation improvements

v0.1.86

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• Documentation improvements

v0.1.85

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• Omit Self: 'async_trait bound in impl when not needed by signature (#​284)

v0.1.84

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• Support impl Trait in return type (#​282)

v0.1.83

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• Prevent needless_arbitrary_self_type lint being produced in generated code (#​278)

v0.1.82

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• Prevent elided_named_lifetimes lint being produced in generated code (#​276)

v0.1.81

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• Turn off unneeded features of syn dependency (#​272, thanks @​klensy)

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