Update heapless requirement from 0.7 to 0.8 in /examples/rp2040 #20

	on: [push, pull_request]

	name: Lib build

	env:
	CARGO_TERM_COLOR: always

	jobs:
	check_format_build:
	name: Lib - Check, Format, Build
	runs-on: ubuntu-latest
	steps:
	#Checkout source
	- name: Checkout sources
	uses: actions/checkout@v4
	#toolchain and tools
	- name: Install stable toolchain
	uses: actions-rs/toolchain@v1
	with:
	toolchain: stable
	components: rustfmt, clippy
	#build and lint
	- name: Run cargo check
	run: cargo check
	- name: Run cargo fmt
	run: cargo fmt --all -- --check
	- name: Run cargo clippy
	run: cargo clippy -- -D warnings
	- name: Run cargo clippy with defmt
	run: cargo clippy --features defmt -- -D warnings
	- name: Run cargo clippy on tests
	run: cargo clippy --tests -- -D warnings
	- name: Run cargo test
	run: cargo test
	- name: Run cargo build
	run: cargo build
	- name: Run cargo build with defmt
	run: cargo build --features defmt

Provide feedback