ci: chores

[DaniPopes]

• unpin nightly
• update actions/checkout
• use dtolnay/rust-toolchain everywhere
• extract Geth installer to its own script
• install cargo-udeps and cross using taiki-e/install-action
• remove:
  • Fuzz workflow. Hasn't been run in over a year (ci: disable fuzzing jobs #559), and doesn't look like it ever will. Should probably also remove the macro automatically-generated fuzz tests. This should also be removed from PR requirements.
  • bench-success: should be removed from PR requirements since it doesn't do anything because benches run during merge groups.
  • sanity/dep-version-constraints: don't understand its purpose, it's just integration tests with a cargo update, but we update at the very least every week so this shouldn't be a problem. This also fails very often.
• run success jobs on ubuntu-latest, not on reth runners

[mattsse]

lgtm, pending @onbjerg

[mattsse]

hmm, some success jobs are now waiting?

[DaniPopes]

Need to remove some jobs from PR requirements. I don't have access to it

[onbjerg]

the reason the actions were named "lint success" etc instead of just success is that github's ui will not differentiate them when adding required actions in the dropdown, making it near impossible to add them. plz keep the old names for that reason

[DaniPopes]

Figured, though I thought it would be the ID not the name. Updated