build(deps): update zbus requirement from 3.6 to 4.3 in /ladspa

[dependabot[bot]]

Updates the requirements on zbus to permit the latest version.

Release notes

Sourced from zbus's releases.

🔖 zbus 4.3.0

• ✨ interface can now generate proxy for you. #236
• 🚑️ Handle FDs received during handshake, in server-side code. #813.
• ✨ object_server::ResponseDispatchNotifier
  • Add response getter.
  • Implement serde::Deserialize for it.
• 📝 Update blocking::Connection::call_method docs.

Commits

• 2c87c06 Merge pull request #845 from zeenix/zbus-rel-4.3.0
• 05fe1dd 🔖 zb,zm: Release 4.3.0
• 1e27941 Merge pull request #844 from Jedsek/main
• e757920 Update client.md
• eca4cf6 Merge pull request #841 from zeenix/interface-proxy-fixes
• 9d80a63 🚑️ zm: Don't skip the first arg of signal
• aae9fe4 ✨ interface to forward doc attributes to proxy
• b50e7a4 📝 zm: Autogenerate docs for proxy struct generated by interface macro
• 14aba57 ♻️ zm: Some refactoring of internal interface API
• 1a1177e 🚚 zm: Rename an internal function
• Additional commits viewable in compare view

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