fix: simplify golangci-lint config for v2, fix lint issues #3

	name: CI

	on:
	push:
	branches: [main]
	pull_request:
	branches: [main]

	permissions:
	contents: read

	jobs:
	test:
	name: Test
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Set up Go
	uses: actions/setup-go@v5
	with:
	go-version-file: go.mod
	cache: true

	- name: Verify dependencies
	run: go mod verify

	- name: Run go vet
	run: go vet ./...

	- name: Run tests
	run: go test -race -coverprofile=coverage.out ./...

	- name: Build
	run: go build ./...

	lint:
	name: Lint
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4

	- name: Set up Go
	uses: actions/setup-go@v5
	with:
	go-version-file: go.mod
	cache: true

	- name: golangci-lint
	uses: golangci/golangci-lint-action@v6
	with:
	version: v2

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