chore(deps): update darling requirement from 0.14.2 to 0.20.8

[dependabot]

Updates the requirements on darling to permit the latest version.

Release notes

Sourced from darling's releases.

v0.20.8

• Add #[darling(with = ...)] support to attrs magic field to allow using custom receiver types for attrs #273

Changelog

Sourced from darling's changelog.

v0.20.8 (February 23, 2024)

• Add #[darling(with = ...)] support to attrs magic field to allow using custom receiver types for attrs #273

v0.20.7 (February 22, 2024)

• Add #[darling(flatten)] to allow forwarding unknown fields to another struct #146
• Don't suggest names of skipped fields in derived impls #268

v0.20.6 (February 14, 2024)

• Fix some missing syn invisible group handling in FromMeta impls #263
• Fix misleading error message on Error::unexpected_type so it no longer implies the type was a literal #264
• Impl FromMeta Vec of literals, e.g. LitStr #265

v0.20.5 (January 30, 2024)

• Add Flag::span inherent method, as Flag can no longer impl syn::spanned::Spanned #242

v0.20.4 (January 29, 2024)

• Accept bare paths in #[darling(default = ...)] #258
• Add FromMeta impl for PathBuf #259
• Improve FromMeta implementation for enums #260
  • Properly implement unit arms in FromMeta::from_list to provide a consistent API for heterogeneous enums that include a mix of unit, newtype and struct variants
  • Add #[darling(word)] attribute for unit enum variants (See #63 for details)

v0.20.3 (July 12, 2023)

• Add FromMeta impl for u128 and i128 #243

v0.20.2 (May 25, 2023)

• Allow darling users to omit quotation marks for paths and idents #236
• Add new util functions for controlling how quotation marks are handled when reading into Expr fields #235

v0.20.1 (May 2, 2023)

• Add Clone impl for NestedMeta #230

v0.20.0 (April 27, 2023)

• Bump syn to version 2, courtesy of @​jonasbb #227

Breaking Changes

• Replace all occurrences of syn::NestedMeta with darling::ast::NestedMeta.

• Replacement for the deprecated AttributeArgs:

... (truncated)

Commits

• 25ce6ec Bump version to 0.20.8
• 7ef3fa9 Support with on attrs magic field
• a1fda4d Add Error::unknown_field_path_with_alts
• 6158749 Bump version to 0.20.7
• d8e65ce Fix flattening to work with 0..n attributes
• 4790d79 Add test for flattening in FromField
• 78ad512 Include parents in "did you mean" suggestions
• 4ad0775 Store similarity score in ErrorUnknownField
• 3eb3e93 Add #[darling(flatten)]
• 60bff90 Add validations for conflicts of flatten with other meta items
• Additional commits viewable in compare view

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