Add rust-version. #3298

	name: Audit
	on:
	push: {}
	pull_request: {}
	schedule:
	- cron: '0 0 * * *'
	jobs:
	vulnerabilities:
	runs-on: ubuntu-latest
	steps:
	- uses: hecrj/setup-rust-action@v2
	- name: Install cargo-audit
	run: cargo install cargo-audit
	- uses: actions/checkout@master
	- name: Resolve dependencies
	run: cargo update
	- name: Audit vulnerabilities
	run: cargo audit

	# artifacts:
	# runs-on: ubuntu-latest
	# steps:
	# - uses: hecrj/setup-rust-action@v2
	# - name: Install cargo-outdated
	# run: cargo install cargo-outdated
	# - uses: actions/checkout@master
	# - name: Delete `web-sys` dependency from `integration` example
	# run: sed -i '$d' examples/integration/Cargo.toml
	# - name: Find outdated dependencies
	# run: cargo outdated --workspace --exit-code 1 --ignore raw-window-handle

Provide feedback