chore(deps): update darling requirement from 0.14.2 to 0.20.3

[dependabot]

Updates the requirements on darling to permit the latest version.

Release notes

Sourced from darling's releases.

v0.20.3

• Add FromMeta impl for u128 and i128 #243

This release also includes features originally slated for 0.20.2, as that was never published.

• 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

Changelog

Sourced from darling's changelog.

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:

// Before
parse_macro_input!(args as AttributeArgs);
// After
match NestedMeta::parse_meta_list(args) {
Ok(v) => v,
Err(e) => {
return TokenStream::from(Error::from(e).write_errors());
}
};

• In GenericParamExt, LifetimeDef is now LifetimeParam.
• In GenericParamExt, as_lifetime_def is renamed to as_lifetime_param.
• Flag and SpannedValue no longer implement syn::spanned::Spanned.
• The MSRV (minimum supported Rust version) is now 1.56, because of syn.

Deprecation Warnings

In previous versions of darling, arbitrary expressions were passed in attributes by wrapping them in quotation marks. v0.20.0 preserves this behavior for syn::Expr, but as a result a field expecting a syn::Expr cannot accept a string literal - it will incorrectly attempt to parse the contents. If this is an issue for you, please add a comment to #229.

v0.14.4 (March 9, 2023)

... (truncated)

Commits

• 99ae0bb Bump version to 0.20.3
• 7928941 Implement FromMeta for i128 and u128
• 8c4d6ad Fix clippy violation
• 371dd9b Bump version to 0.20.2
• 6d6f6e0 Add new parsing util functions for Exprs
• 9bdda12 Accept paths and idents without quotation marks in value positions
• 6f15cc3 Update README.md
• f6167fe Bump version to 0.20.1
• e4d22dd Allow Cloneing NestedMeta
• ffb9cc8 Update CHANGELOG
• Additional commits viewable in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)

[dependabot]

Superseded by #131.