Update `flame_audio` to support `audioplayers:^6.0.0`

[parlough]

What could be improved

package:audioplayers had a 6.0.0 release with lots of fixes and some breaking changes, but flame_audio has a ^5.0.0 constraint.

Why should this be improved

So users of flame_audio can benefit from the latest fixes and changes in audioplayers :)

Risks

Likely best to not support both major versions, so downstream users who depend on audioplayers:^5.0.0 might have to complete a few migrations to update to the updated flame_audio release.

More information

No response

Other

• [ ] Are you interested in working on a PR for this?