Update heapless

[luqasz]

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[dzamlo]

This would be a breaking changes.

[jamesmunns]

Yeah, I agree with @dzamlo, heapless types appear in the public interface, so upgrading it would be a breaking change.

I am not certain, but I've considered doing the following:

• adding heapless-v0_7 and heapless-v0_8 features, using those versions specifically, maybe in some module-d scope, for things like to_vec, to_vec_cobs
• keeping heapless as an alias for heapless-v0_7, but marking it as deprecated.

Open to feedback if people think there is a preferrable solution.

[jamesmunns]

Merging and will sort out the versioning stuff before the next release.