fix: upgrade @actions/core to fix set-output issue #8

	name: Build and test
	on:
	push:
	tags:
	- v*
	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: Cache dependencies
	uses: actions/cache@v2
	with:
	path: '**/node_modules'
	key: node-modules-${{ hashfiles('**/package-lock.json') }}
	- name: Github checkout
	uses: actions/checkout@v4
	- name: Setup node.js environment
	uses: actions/setup-node@v4
	with:
	node-version: '14.16'
	- name: Install NPM dependencies
	run: npm i [email protected] -g && npm i
	- name: Compile Typescript files
	run: tsc
	- name: Execute unit tests
	run: npm run coverage
	- name: Publish to coveralls.io
	uses: coverallsapp/[email protected]
	with:
	github-token: ${{ secrets.GITHUB_TOKEN }}
	path-to-lcov: ./reports/coverage/lcov.info

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