set go version to 1.21 #643

	name: Continuous Integration
	on: [push]
	jobs:
	build:
	name: Build
	runs-on: ${{ matrix.os }}
	strategy:
	matrix:
	go: ["1.21"]
	os: [ubuntu-latest, macos-latest, windows-latest]
	steps:
	- name: Set up Go
	uses: actions/setup-go@v4
	with:
	go-version: ${{ matrix.go }}
	id: go

	- name: Check out code into the Go module directory
	uses: actions/checkout@v4

	- name: Get dependencies
	run: \|
	go get -v -t -d ./...

	- name: Build
	run: go build -v .

	- name: Run Unit Tests
	run: go test -v .

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