chore: unify all package versions to 0.4.3

All crates (core, plugins, runtimes, plugin-api) now share the same
version number for simpler release management and clearer compatibility.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

crates/owlry-plugin-scripts/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "owlry-plugin-scripts"
-version = "0.2.1"
+version = "0.4.3"
 edition.workspace = true
 rust-version.workspace = true
 license.workspace = true