Update to go 1.21 and golangci to 1.60.0, test with go 1.23 (#71) #1064

	name: ci
	on:
	push:
	branches: [main]
	tags: ['v*']
	pull_request:
	branches: [main]
	schedule:
	- cron: '15 22 * * *'
	workflow_dispatch: {} # support manual runs
	permissions:
	contents: read
	jobs:
	ci:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	go-version: [1.21.x, 1.22.x, 1.23.x]
	steps:
	- name: Checkout Code
	uses: actions/checkout@v4
	with:
	fetch-depth: 1
	- name: Install Go
	uses: actions/setup-go@v5
	with:
	go-version: ${{ matrix.go-version }}
	- name: Test
	run: make test
	- name: Lint
	# Often, lint & gofmt guidelines depend on the Go version. To prevent
	# conflicting guidance, run only on the most recent supported version.
	if: matrix.go-version == '1.23.x'
	run: make checkgenerate && make lint

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