fix: write errors/warnings to stderr rather than stdout #965

	name: CI
	on:
	push:
	branches: [main]
	pull_request: {}
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	go: [1.21, 1.22, 1.23]
	name: Build & Test
	steps:
	- uses: actions/checkout@v4
	- name: Setup go
	uses: actions/setup-go@v5
	with:
	go-version: ${{ matrix.go }}
	- name: golangci-lint
	uses: golangci/golangci-lint-action@v6
	with:
	version: v1.60.1
	- run: go test -coverprofile=coverage.txt -covermode=atomic ./...
	- uses: codecov/codecov-action@v4
	with:
	token: ${{ secrets.CODECOV_TOKEN }}

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