Update Rust crate diesel to 2.2.8

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
diesel (source)	workspace.dependencies	patch	2.2.7 -> 2.2.8

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Release Notes

diesel-rs/diesel (diesel)

v2.2.8: Diesel 2.2.8

Compare Source

Fixed

• Allow #[diesel(check_for_backend(_))] to check fields with #[diesel(embed)] annotations
• Improve custom compile error message around CompatibleType
• Fix a bug that restricted the number of allowed columns in COPY FROM statements to 12
• Expose some SqliteValue helper functions
• Use consistent whitespace in ASC/DESC, DISTINCT ON, and DELETE FROM clauses

You can support the development of diesel by contributions or by sponsoring the project on Github

Full Changelog: diesel-rs/diesel@v2.2.7...v2.2.8

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