bump: downgrade cargo edition to 2021 #8

	name: Rust checks

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

	env:
	CARGO_TERM_COLOR: always

	jobs:
	format:
	name: Check Formatting
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Install Rust toolchain
	uses: actions-rs/toolchain@v1
	with:
	toolchain: nightly-2024-12-11
	override: true
	components: rustfmt
	- name: Run cargo fmt to check formatting
	run: cargo fmt --all -- --check

	check:
	name: Run cargo check on RISC-V targets
	runs-on: ubuntu-latest
	strategy:
	matrix:
	target:
	- riscv32imac-unknown-none-elf
	- riscv64imac-unknown-none-elf
	- riscv32imc-unknown-none-elf
	- riscv64gc-unknown-linux-gnu

	steps:
	- uses: actions/checkout@v3
	- name: Install Rust toolchain
	uses: actions-rs/toolchain@v1
	with:
	toolchain: nightly-2024-12-11
	target: ${{ matrix.target }}
	override: true

	- name: Install RISC-V target support
	run: \|
	rustup target add ${{ matrix.target }}

	- name: Run cargo check for xuantie-riscv
	run: \|
	cd xuantie-riscv
	cargo check --target ${{ matrix.target }}

Provide feedback