fix dialyzer workflow by using v4 of actions/cache #25

	name: Elixir CI

	on:
	push:
	branches: [ "**" ]

	jobs:
	build:

	name: Build and test
	runs-on: ubuntu-latest

	steps:
	- uses: actions/checkout@v3
	- name: Set up Erlang & Elixir
	uses: erlef/setup-beam@v1
	with:
	elixir-version: '1.15.6'
	otp-version: '26.0'
	- name: Restore dependencies cache
	uses: actions/cache@v4
	with:
	path: deps
	key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
	restore-keys: ${{ runner.os }}-mix-
	- name: Install dependencies
	run: mix deps.get
	- name: Run tests
	run: mix test
	- name: Check formatting
	run: mix format --check-formatted
	- name: Retrieve PLT Cache
	uses: actions/cache@v4
	with:
	path: priv/plts
	key: ${{ runner.os }}-${{ matrix.otp }}-${{ matrix.elixir }}-plts-${{ hashFiles(format('{0}{1}', github.workspace, '/mix.lock')) }}
	- name: Run Dialyzer
	run: mix dialyzer --halt-exit-status --format short

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