Update github actions to use versions that support Node.js16

[de-husk]

Github is going to drop support for actions running <NodeJS 16 by "Summer 2023".

You can see the deprecation warnings in the CI job summaries.

Sadly we need to entirely stop using actions-rs/cargo as it has been confirmed to be no longer maintained will just stop working.

[de-husk]

Looks like https://github.com/dtolnay/rust-toolchain is a good alternative.

[JakeHartnell]

Don't think this is relevant anymore?

[dtolnay]

@JakeHartnell, still relevant. This never got fixed. The current main branch (currently 9261bb3) still has actions-rs/cargo multiple places in its CI. The CI job summaries are still showing piles of alerts about this problem.

dao-contracts/.github/workflows/basic.yml

Lines 23 to 28 in 9261bb3

	- name: Run tests
	uses: actions-rs/cargo@v1
	with:
	toolchain: nightly
	command: unit-test
	args: --locked