Update Rust crate diesel-async to v0.6.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
diesel-async	dependencies	minor	=0.5.2 -> =0.6.0
diesel-async	dev-dependencies	minor	=0.5.2 -> =0.6.0

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Release Notes

weiznich/diesel_async (diesel-async)

v0.6.0: Diesel-Async 0.6.0

Compare Source

• Allow to control the statement cache size
• Minimize dependencies features
• Bump minimal supported mysql_async version to 0.36.0
• Fixing a bug in how we tracked open transaction that could lead to dangling transactions is specific cases

You can support the development of diesel-async by contributions or by sponsoring the project on GitHub.

Full Changelog: https://github.com/weiznich/diesel\_async/compare/v0.5.2...v0.6.0

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