Update to go 1.21 #357

	name: membership-checker

	permissions: read-all

	on:
	pull_request:
	paths:
	- '.ci/magician/**'

	jobs:
	build-and-unit-tests:
	runs-on: ubuntu-22.04
	steps:
	- uses: actions/checkout@v4
	- name: Set up Go
	uses: actions/setup-go@v4
	with:
	go-version: '^1.21'
	- name: Run membership checker unit tests
	run: \|
	cd .ci/magician
	go test ./... -v

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