Update actions/checkout digest to b4ffde6 #2106

	#
	# Configuration for GitHub-based CI, based on the stock GitHub Rust config.
	#
	name: Rust

	on:
	push:
	branches: [main]
	pull_request:
	branches: [main]

	jobs:
	check-style:
	runs-on: ubuntu-22.04
	steps:
	- uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
	- name: Report cargo version
	run: cargo --version
	- name: Report rustfmt version
	run: cargo fmt -- --version
	- name: Check style
	run: cargo fmt -- --check

	clippy-lint:
	runs-on: ubuntu-22.04
	steps:
	- uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
	- name: Report cargo version
	run: cargo --version
	- name: Report Clippy version
	run: cargo clippy -- --version
	- name: Run Clippy Lints
	# Clippy's style nits are useful, but not worth keeping in CI. This
	# override belongs in src/lib.rs, but that doesn't reliably work due to
	# rust-lang/rust-clippy#6610.
	run: cargo clippy --all-targets -- --deny warnings --allow clippy::style

	build-and-test:
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	os: [ubuntu-20.04, windows-2022, macos-12]
	features: [ all, default ]
	include:
	- features: all
	feature_flags: --all-features
	steps:
	- uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11
	- name: Report cargo version
	run: cargo --version
	- name: Report rustc version
	run: rustc --version
	- name: Build
	run: cargo build ${{ matrix.feature_flags }} --locked --all-targets --verbose
	- name: Run tests
	run: cargo test ${{ matrix.feature_flags }} --locked --all-targets --verbose

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