Update Rust crate diesel-async to v0.5.2

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
diesel-async	dependencies	patch	=0.5.1 -> =0.5.2
diesel-async	dev-dependencies	patch	=0.5.1 -> =0.5.2

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Release Notes

weiznich/diesel_async (diesel-async)

v0.5.2

Compare Source

• Fixed an issue around transaction cancellation that could lead to connection pools containing connections with dangling transactions

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[codecov]

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