Node v21 - issue with `navigator` object

[bricss]

Runtime goes kaboom 💥 in Node v21 with following error:

TypeError: Cannot read properties of undefined (reading 'indexOf')

All the details can be found -> here

[sigmundch]

@rakudrama note an external contribution in https://dart-review.googlesource.com/c/sdk/+/330987 is available for review.

[nex3]

Dart Sass is getting a ton of issues about this, and there's a lot of activity on StackOverflow as well. Please prioritize this fix.

[ntkme]

Now the fix has landed in main. It needs to be backported to stable (& beta) branch, then we can cut a new dart-sass release. Can someone from dart team help us with the backporting?

[sigmundch]

Thank you @ntkme so much for the PR. We'll get the cherry-pick process started.

@rakudrama - let me know if you are already starting the cherry-pick or if you'd like me to help doing so.