Bump diesel from 2.3.6 to 2.3.8

[dependabot]

Bumps diesel from 2.3.6 to 2.3.8.

Changelog

Sourced from diesel's changelog.

[2.3.8] 2026-04-24

• Added support for libsqlite3-sys 0.37.0
• Raise a compile-time error when mixing aggregate and non-aggregate expressions in an ORDER BY clause without a GROUP BY clause
• Calling .count() or .select(aggregate_expr) on a query that already has a non-aggregate .order_by() clause now raises a compile-time error instead of generating invalid SQL that would be rejected by the database at runtime (fixes #3815)
• Added documentation for migration transaction behaviour at the crate root
• Improved compile time error messages for #[derive(AsChangeset)]
• Allow to use generic types in infix_operator!()
• Fixes for several instances of unsound, unspecified or otherwise dangerous behaviour:
  • Unsound string construction in SqliteValue::read_text/FromSql<Text, Sqlite> for String
  • Invalid alignment for over aligned data in SqliteConnection::register_function for aggregate functions
  • Potential memory leaks in SqliteConnection::register_function
  • Access to padding bytes while serializing Date/time types in the Mysql backend
  • SQL Option Injection in PostgreSQL COPY FROM/TO
  • Unspecified pointer cast in Debug/Display implementation of batch INSERT statements for SQLite
  • Invalid call order of SQLite API functions in SqliteValue::read_text/FromSql<Text, Sqlite> for String/SqliteValue::read_blob()/FromSql<Binary, Sqlite> for Vec<u8>
  • Potential unsound pointer access for FromSql<Binary, _> for Vec<u8> and FromSql<Text, _> for String for third party backends (requires changes to the third party backend as well)

[2.3.7] 2026-03-13

• Add support for libsqlite3-sys 0.36
• Fix a potential resource leak if establishing a SqliteConnection fails.

Commits

• 58820dc Merge pull request #5036 from weiznich/prepare_2.3.8
• 895b5ba Prepare a 2.3.8 release
• ea008d3 Fix several UB instances
• 64003c6 Merge pull request #5034 from ayarotsky/fix-reject-aggregate-select-with-non-...
• 49b936e Merge pull request #5012 from ayarotsky/fix-aggregate-expressions-and-order-by
• d4a0495 Merge pull request #5035 from weiznich/bump/rust_1.95
• 5e0289e Merge pull request #5027 from barry3406/fix/infix-operator-generic-types
• 367c7f5 Merge pull request #5017 from ThunderComplex/feature/ignore_empty_dir_in_migr...
• 305cc7a Merge pull request #5011 from ayarotsky/docs-transaction-behavior
• 6797867 Merge pull request #5009 from XiaoPengMei/docs/clarify-insertable-serialize-a...
• Additional commits viewable in compare view

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[dependabot]

Looks like diesel is up-to-date now, so this is no longer needed.