fix: upgrade CI Go version to 1.21 #1338

	name: Build

	on: [push, pull_request]

	jobs:
	test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	go: ['1.19', '1.20', '1.21']
	steps:
	- uses: actions/checkout@v2

	- name: Set up Go
	uses: actions/setup-go@v2
	with:
	go-version: ${{ matrix.go }}

	- name: Run go test
	run: make test

	benchmark:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	go: ['1.19', '1.20', '1.21']
	steps:
	- uses: actions/checkout@v2

	- name: Set up Go
	uses: actions/setup-go@v2
	with:
	go-version: ${{ matrix.go }}

	- name: Run go test bench
	run: make benchmark

	lint:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2

	- name: Set up Go
	uses: actions/setup-go@v2
	with:
	go-version: '1.20'

	- name: golangci-lint
	uses: golangci/golangci-lint-action@v3
	with:
	version: v1.51

	semantic-release:
	needs: [test, lint]
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2

	- name: Run semantic-release
	if: github.repository == 'casbin/casbin' && github.event_name == 'push'
	run: make release
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

Provide feedback