Use the main branch of the risc0 monorepo for development

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This changes all the references for packages from risc0 in the Cargo.toml files. During development, we want to stay up to date with the main branch of risc0, and only switch to a stable release during the release process. With 1.0 approaching very soon now, the rate of breaking changes should slow significantly.

Resolves: #73
Resolves: #89

Co-authored-by: carlosgj94

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This PR sits on top of #87

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CI is failing because it installs cargo-risczero 0.21 instead of from main. I will work on fixing that.

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Will have to think how effects the release, in particular, testing the release branch.

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Getting closer! It looks like all the tests running with either cuda or metal fail at test bonsai_rest_api_mock::test::local_bonsai. Error is not particularly helpful and no idea off the top of my head why this might be happening. I can keep looking into this later.

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Ci failures could be a caching issue. Should try resetting the cache. Example
4f127ca