Swatinem/rust-cache is causing warnings in the CI

[tertsdiepraam]

We see the following warning in the CI:

The `save-state` 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/

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/

We already fixed the warnings in our own yaml files (#4098), but rust-cache is still generating some.

According to Swatinem/rust-cache#83, updating to v2 should fix the issue, but we need to check for breaking changes.

[tertsdiepraam]

Oh this one might also be partially solved by this upgrade:

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: Swatinem/rust-cache@v1, actions-rs/toolchain@v1

[miles170]

I also found out that actions-rs/toolchain@v1 should come before Swatinem/rust-cache@v1 since rust-cache uses the rustc version as its cache key.

I can work on updating GitHub actions to run on Node 16.