Update Dart webassembly-language-support.md

[KyleFin]

Update language matrix to be aligned with @kevmoo's 6cb4c1e

• Dart (and Flutter) have core and browser support: https://dart.dev/web/wasm
• WASI support is tracked in [proposal] [dart2wasm] Wasm component model / WASI support dart-lang/sdk#56366

Content must go through a pre-merge checklist.

Pre-Merge Content Checklist

This documentation has been checked to ensure that:

• The title, template, and date are all set
• Does this PR have a new menu item (anywhere in templates/*.hbs files) that points to a document .md that is set to publish in the future? If so please only publish the .md and .hbs changes in real-time (otherwise there will be a menu item pointing to a .md file that does not exist)
• File does not use CRLF, but uses plain LF (hint: use cat -ve <filename> | grep $'\r' | wc -l and expect 0 as a result)
• Has passed bart check
• Has been manually tested by running in Spin/Bartholomew (hint: use PREVIEW_MODE=1 and run npm run styles to update styling)
• Headings are using Title Case
• Code blocks have the programming language set to properly highlight syntax and the proper copy directive
• Have tested with npm run test and resolved all errors
• Relates to an existing (potentially outdated) blog article? If so please add URL in blog to point to this content.

[KyleFin]

I'm curious about this definition. GC languages require 2.0, right? So should Core column be ❌ for Dart, Java, Kotlin, etc?

If not, then I believe Dart should be ✅

[itowlson]

@technosophos I'm going to merge this on the basis of Kotlin being green, but I may be misunderstanding your intent with the Core column. If so let me know and we can put it back to what you intended (running it past Kyle of course).

[itowlson]

CI fail is an unrelated broken link at sigstore

[itowlson]

My apologies, @KyleFin, I forgot to say thank you for this!

[KyleFin]

Happy to help! Thanks @itowlson :)