Update distribution-scripts

[straight-shoota]

Updates distribution-scripts dependency to https://github.com/crystal-lang/distribution-scripts/commit/a9e0c6c12987b8b01b17e71c38f489e45937e1bf

This includes the following changes:

• crystal-lang/distribution-scripts#304

[straight-shoota]

Yes. We removed the lib prematurely without checking that we have alternatives in place. And in some cases this isn't even possible, so we'll have to keep it around for a while.

[oprypin]

It seems this didn't help for that breakage?

https://github.com/crystal-lang/install-crystal/actions/runs/9090739712/job/24993502252

[straight-shoota]

Today's nightly build failed due to #14595. So it's still using the previous build without libgc.