Bump actions/setup-go from 2 to 4 #151

	name: unit-tests

	on:
	pull_request: ~
	push: ~

	jobs:
	build:
	runs-on: ubuntu-latest
	steps:
	- name: checkout
	uses: actions/checkout@v2
	with:
	fetch-depth: 0

	- name: set up go
	uses: actions/setup-go@v4
	with:
	go-version: "1.21"

	- name: cache go modules
	uses: actions/cache@v1
	with:
	path: ~/go/pkg/mod
	key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
	restore-keys: \|
	${{ runner.os }}-go-

	- name: tests
	run: \|
	go test -v ./...

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