sile 0.15.8

[alerque]

Replaces #197650 which doesn't actually take into consideration any of the details of this update like removing the now obsolete ICU workaround or using the new upstream configure flag that was specifically to accommodate Homebrew's resource handling.

To be merged after #196600 which takes care of some other known issues unrelated to the version bump.

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[alerque]

Something seems to be wrong with linking the new dynamically loaded rusile module on Darwin, I'm looking into it upstream. Marking this as draft until that is resolved.

[alerque]

Somehow this isn't noticing that we're on macOS and using .dylib instead of .so:

https://github.com/Homebrew/homebrew-core/actions/runs/12293281994/job/34305808506?pr=197800#step:3:1874

This did work testing upstream in in CI via macOS building using Homebrew supplied dependencies building from source:

https://github.com/alerque/sile/actions/runs/12292956425/job/34304658415