Update to raylib 6.x

[RobLoach]

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[Copilot]

Pull request overview

Updates this project’s raylib/Umka integration to align with newer upstream versions (raylib 6.x and Umka 1.5.x), adjusting code generation and runtime glue so examples/tests can run again.

Changes:

• Bumped project/tooling versions and updated dependencies (raylib + Umka, generator schema inputs).
• Updated the Umka runtime invocation code in bin/raylib-umka.c to newer Umka API patterns.
• Adjusted generator type mappings/struct field handling and tweaked a lifecycle assertion in the Umka test.

Reviewed changes

Copilot reviewed 6 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
tests/raylib-umka-tests.um	Removes a post-CloseWindow() readiness assertion in the lifecycle test.
package.json	Version bump; script refactor; switches @raylib/api to a GitHub ref; bumps gh-pages.
generator/index.js	Updates struct/type mappings and field-name escaping for Umka codegen; updates dependency docs.
CMakeLists.txt	Version bump to 0.6.0.
cmake/Findumka.cmake	Updates fetched Umka tag/version to v1.5.5.
cmake/Findraylib.cmake	Pins raylib FetchContent GIT_TAG to a specific commit SHA.
bin/raylib-umka.c	Updates to new Umka function call/get-error APIs and adjusts web update callback call signature.

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