ext-php-rs-derive-v0.11.3

Added

• (enum) Add basic enum support (by @Xenira, @joehoyle) [#178] [#302]
• Add constructor visibility (by @Norbytus) [#542]

Other

• (clippy) Fix new clippy findings (by @Xenira) [#543]
• (deps) Upgrade bindgen to 0.72 (by @ptondereau)
• (deps) Remove unused deps (by @robem)
• (deps) Update darling requirement from 0.20 to 0.21 (by @dependabot[bot])
• (macro) Add test infrastructure for macro crate (by @Xenira) [#530]
• (readme) Update example in readme (by @joehoyle) [#539]
• Update guide url and authors (by @Xenira) [#500]