CI: part or all actions-rs unmaintained

[Razaloc]

actions-rs/toolchain seems to be unmaintained. Something similar with actions-rs/cargo We use it and at some point part of it will be deprecated; we need to make it compatible with Node.js 16. CI raise this warning:

Node.js 12 actions are deprecated. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/. Please update the following actions to use Node.js 16: actions-rs/toolchain@v1, actions-rs/cargo@v1

Also:
The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

[Razaloc]

This issue might be relevant for other projects, also using actions-rs/toolchain and actions-rs/cargo:
lava-api
lava-gitlab-runner
gitlab-runner-rs
obs-gitlab-runner
open-build-service-rs
hawkbit-rs
If this patch turns out to solve the problem I could apply the same solution to the others

[Razaloc]

Version 1.1.0 uses Node16 (instead of Node12)
Update the action to run on Node 16
This two PRs should solve the warnings, in that case we wouldn't need #57

[obbardc]

This is covered at actions-rs/toolchain#216 ; I have subscribed to that.

[sjoerdsimons]

fwiw for my other crates i've moved to https://github.com/dtolnay/rust-toolchain