build(deps): update darling requirement from 0.13 to 0.14

[dependabot[bot]]

Updates the requirements on darling to permit the latest version.

Release notes

Sourced from darling's releases.

v0.14.0

• BREAKING CHANGE: Remove many trait impls from util::Flag. This type had a number of deref and operator impls that made it usable as sort-of-a-boolean. Real-world usage showed this type is more useful if it's able to carry a span for good errors, and that most of those impls were unnecessary. #179
• Remove need for #[darling(default)] on Option<T> and Flag fields #161
• Improve validation of enum shapes #178
• Bump proc-macro2 dependency to 1.0.37 #180
• Bump quote dependency to 1.0.18 #180
• Bump syn dependency to 1.0.91 #180

Changelog

Sourced from darling's changelog.

v0.14.0 (April 13, 2022)

• BREAKING CHANGE: Remove many trait impls from util::Flag. This type had a number of deref and operator impls that made it usable as sort-of-a-boolean. Real-world usage showed this type is more useful if it's able to carry a span for good errors, and that most of those impls were unnecessary. #179
• Remove need for #[darling(default)] on Option<T> and Flag fields #161
• Improve validation of enum shapes #178
• Bump proc-macro2 dependency to 1.0.37 #180
• Bump quote dependency to 1.0.18 #180
• Bump syn dependency to 1.0.91 #180

v0.13.4 (April 6, 2022)

• Impl FromMeta for syn::Visibility #173

v0.13.3 (April 5, 2022)

• Add error::Accumulator for dealing with multiple errors #164
• Impl FromMeta for syn::Type and its variants #172

v0.13.2 (March 30, 2022)

• Impl FromMeta for syn::ExprPath #169

v0.13.1 (December 7, 2021)

• Add FromAttributes trait and macro #151

v0.13.0 (May 20, 2021)

• Update darling to 2018 edition #129
• Error on duplicate fields in #[darling(...)] attributes #130
• Impl Copy for SpannedValue<T: Copy>
• Add SpannedValue::map_ref

v0.13.0-beta (April 20, 2021)

• Update darling to 2018 edition #129
• Error on duplicate fields in #[darling(...)] attributes #130

v0.12.4 (April 20, 2021)

• Add and_then to derive macros for darling

v0.12.3 (April 8, 2021)

• Fix FromMeta impl for char not to panic #126

v0.12.2 (February 23, 2021)

... (truncated)

Commits

• 3f36647 Bump version to 0.14.0
• 77075f4 Bump min versions of quote, syn, and proc-macro2
• 3c7d57a Update documentation to capture #161
• bb12ae2 Add CHANGELOG entry for Flag
• b8bc277 Improve Flag documentation
• 956ef2b Add Span to util::Flag, and remove Deref impl
• 2e29e0e Accept allow_unknown_fields = false
• 09ecbd6 Move Flag to its own module
• 445e6bb Improve enum shape validation (#178)
• a0fb9cc Use from_none in codegen
• Additional commits viewable in compare view

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