Fix intermittent failures with CI build and clean up #188
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There were recently a lot of hiccups with installing rustup for Windows in CI. For example here. This PR switches to a current and actively maintained action for installing the Rust toolchain.
The previous issues were intermittent and could be overcome by trying several times. But let's have a less dicey way for running CI checks. This PR also includes cleaning up warnings from issues with outdated configuration and actions.