Update darling requirement from 0.10 to 0.13 in /language-server-macros

[dependabot-preview]

Updates the requirements on darling to permit the latest version.

Changelog

Sourced from darling's changelog.

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)

• Impl FromMeta for HashMap<Ident, V> and HashMap<Path, V>

v0.12.1 (February 22, 2021)

• Impl FromMeta for syn::ExprArray #122
• Remove use of unreachable from darling::ast::Data #123
• Add darling::ast::Data::try_empty_from to avoid panics when trying to read a union body #123

v0.12.0 (January 5, 2021)

• POSSIBLY BREAKING: Derived impls of FromDeriveInput, FromField, FromVariant, and FromTypeParam will now error when encountering an attribute darling has been asked to parse that isn't a supported shape. Any crates using darling that relied on those attributes being silently ignored could see new errors reported in their dependent crates. #113
• Impl syn::spanned::Spanned for darling::util::SpannedValue #113
• Add darling::util::parse_attribute_to_meta_list to provide useful errors during attribute parsing #113
• Add impl From<syn::Error> for Error to losslessly propagate syn errors #116

v0.11.0 (December 14, 2020)

• Bump minor version due to unexpected breaking change #107

v0.10.3 (December 10, 2020)

• Add discriminant magic field when deriving FromVariant #105

v0.10.2 (October 30, 2019)

• Bump syn dependency to 1.0.1 #83

... (truncated)

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