Update ahash to fix cargo install --locked

[itsjunetime]

Description

Right now, eww fails to install when invoked with cargo install --git $url because of some API changes made to dbusmenu-glib that violate semver (at least, I think? I'm still not 100% certain what exactly those errors come from; they may be from the rust-glib or rust-gtk bindings?). So cargo install --git $url --locked should work (since it won't update the broken crate to the broken version), but ahash is currently specified as 0.7.6, which is yanked from crates.io since it doesn't build in the configuration that eww is using it with.

This simply updates the yanked version of ahash so that eww can continue to be installed via cargo install --git $url --locked.

Checklist

Please make sure you can check all the boxes that apply to this PR.

• All widgets I've added are correctly documented.
• I added my changes to CHANGELOG.md, if appropriate.
• The documentation in the docs/content/main directory has been adjusted to reflect my changes.
• I used cargo fmt to automatically format all code before committing

I don't think anything on the checklist applies to this PR.