Update Rust crate diesel to v2.3.12

[oxide-renovate]

This PR contains the following updates:

Package	Type	Update	Change
diesel (source)	workspace.dependencies	patch	2.3.11 → 2.3.12

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Release Notes

diesel-rs/diesel (diesel)

v2.3.12

Compare Source

• Fixed FromSql/ToSql for chrono::NaiveTime on MySQL dropping the fractional-seconds component of TIME values, so a TIME(N) column now round-trips its microseconds like DATETIME / TIMESTAMP already did.
• Extended libsqlite3-sys support to include 0.38

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