Bump diesel from 2.0.4 to 2.1.6

[dependabot]

Bumps diesel from 2.0.4 to 2.1.6.

Changelog

Sourced from diesel's changelog.

[2.1.6] 2024-04-19

• Fix using BoxableExpression with having clauses
• Fix using numeric expressions with aliased fields
• Minor documentation fixes

[2.1.5] 2024-03-15

• Fix impl SqlOrd postgres > postgres_backend feature flag.
• Allow Queryable to be used with multiple table names.
• Fix an inconsistent unit test
• Fix a clippy lint
• Fix ./bin/test feature flag calls.
• Update libsqlite3-sys to allow version 0.28 as well

[2.1.4] 2023-11-14

• Update libsqlite3-sys to allow version 0.27 as well

[2.1.3] 2023-10-05

• Increased accidently decreased limit around element count in DISTINCT ON and ORDER BY clauses again as that broke existing code

[2.1.2] 2023-09-25

Fixed

• Fixed another potential breaking chaneg around queries containing DISTINCT ON and ORDER BY clauses consisting of custom sql expressions (e.g. .nullable())
• Fixed an issue where #[derive(Selectable)] and #[diesel(check_for_backend)] generates invalid rust code if the struct contains lifetimes/generic types

[2.1.1] 2023-08-25

Fixed

• Fixed an issue in diesel-cli that lead to using unquoted table names in one of the internal queries
• Fixed a bug in diesel print-schema that lead to generating invalid table! macros if both the #[sql_name] and the #[max_length] attribute are present
• Fixed an issue in diesel-cli that lead to ignoring certain foreign key constraints for postgresql
• Fixed an crash while using diesel print-schema with really old sqlite versions
• Fixed an issue where #[diesel(check_for_backend)] ignored #[diesel(deserialize_as)] attributes
• Fixed several issues with the new #[derive(MultiConnection)] feature
• Fixed some edge cases in our sqlite timestamp parsing behaviour
• diesel migration generate --diff-schema now respects table filters as setup for print-schema via diesel.toml
• Fixed a potential breaking change around queries containing DISTINCT ON and ORDER BY clauses consisting of custom sql expressions (e.g. diesel::dsl::sql)

Added

• Support for bigdecimal 0.4

[2.1.0] 2023-05-26

... (truncated)

Commits

• 26c6be4 Preapare a diesel 2.1.6 patch release
• 2dc6cc1 Merge pull request #3956 from Tanguille/docs/clarify-as-expression-to-sql
• ca66173 Merge pull request #3980 from kornelski/dev-cycle
• 45915ac Merge pull request #3971 from Ten0/fix_missing_skip_insertion_attribute_in_un...
• 26b8803 Merge pull request #3979 from formlogic-kirk/alias_op_impls
• 6a9bfdf Fix the having clause tests + add a test for normal select queries
• 0799a44 Add ValidGrouping to boxed having expression
• 5d6637f Try explicitly implementing FromClause<F> for HavingDsl<Predicate>
• b4776a3 Add test
• c96c870 Merge pull request #3959 from 1Dragoon/backports/2.1.4
• Additional commits viewable in compare view

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