CI fix: hardcode a separate Rust version to use with do_checks.sh#3

ImplOfAnImpl merged 1 commit intofeature/ledger-coin-typemintlayer/mintlayer-core-primitives:feature/ledger-coin-typefrom

fix_cargo_deny_installation_on_cimintlayer/mintlayer-core-primitives:fix_cargo_deny_installation_on_ciCopy head branch name to clipboard