Bump actions/checkout from 3.5.3 to 4.0.0 #171

	name: CI

	on: [push]

	jobs:
	test_msrv:
	name: test on MSRV
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4.0.0
	- uses: actions-rs/toolchain@v1.0.7
	with:
	# When toolchain is not specified, it uses rust-toolchain, which is the MSRV
	override: true
	- uses: actions-rs/cargo@v1.0.3
	with:
	command: test
	args: --all-features
	test_nightly:
	name: test on nightly
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4.0.0
	# Because we use nightly features for building docs,
	# using --all-features will fail without nightly toolchain.
	- uses: actions-rs/toolchain@v1.0.7
	with:
	toolchain: nightly
	override: true
	- uses: actions-rs/cargo@v1.0.3
	with:
	command: test
	args: --all-features
	build_no_std:
	name: build with no_std
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4.0.0
	- uses: actions-rs/toolchain@v1.0.7
	with:
	toolchain: stable
	override: true
	# This does not support std, so we use to test if no_std works
	target: thumbv6m-none-eabi
	- uses: actions-rs/cargo@v1.0.3
	with:
	command: build
	# Disables std feature
	args: --no-default-features --target thumbv6m-none-eabi

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