Bump to axum 0.8

[CleanCut]

I updated axum to 0.8 in crates/twirp/Cargo.toml and then ran cargo test (which passed!) and committed the resulting updated Cargo.lock file.

@jorendorff How can I make sure this doesn't break things that use it? Will opening up a PR on blackbird that points to this branch for twirp-rs* be sufficient?

Resolves #150

Once this is tested and merged, I anticipate publishing a new version of twirp-rs and twirp-build-rs to crates.io.

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[jorendorff]

How can I make sure this doesn't break things that use it? Will opening up a PR on blackbird that points to this branch for twirp-rs* be sufficient?

Good idea. We don't have a better way. Looking at the axum 0.8 release notes, it appears this is a pretty big change, so I suggest doing a breaking version-bump here as well (to twirp-rs 0.8 or whatever).

The changes might not affect Blackbird - for example, I don't think we get any parameters from parsing request paths - but all three of the breaking changes described in the release notes affect things I've at least heard of, and it says there are other "less visible" breaking changes as well, so I'm not super optimistic.

[CleanCut]

I made a blackbird PR that pulls in the twirp-rs bump of axum 0.8. CI passes! 🥳 🎉

@jorendorff Do we need to do some live tests in non-serving production clusters as well, before feeling good about finalizing the various PRs involved?

[jorendorff]

@CleanCut Please branch-deploy to a non-serving cluster. The probers will tell us if anything's seriously wrong.

[CleanCut]

Branch deployed, ran all night, no problems! 👍🏻

[jorendorff]

🚀