Migrate Rust toolchain action from actions-rs/toolchain to an action that is still maintained

[SteveLauC]

Just found that we are still using actions-rs/toolchain and actions-rs/cargo in the CI, they have already been archived, we should switch to an action that is maintained, e.g., dtolnay/rust-toolchain.

actions-rs/toolchain has an override parameter which is not provided by dtolnay/rust-toolchain, but we can do it manually:

      - name: Setup | Override toolchain
        run: rustup override set ${{ matrix.toolchain }}

actions-rs/cargo has a feature that is not supported by dtolnay/rust-toolchain as well, if we don't rely on this, we can simply invoke cargo manually:

2. Warnings and errors issued by cargo will be displayed in GitHub UI

[github-actions]

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