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Lower swift-tools-version to 6.3 so CI can run #7

	name: CI

	on:
	push:
	branches: [main]
	pull_request:
	branches: [main]

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	build-and-test:
	name: Build and test
	runs-on: macos-latest

	steps:
	- uses: actions/checkout@v4

	- name: Show toolchain
	run: \|
	xcode-select -p
	swift --version

	- name: Build
	run: swift build

	- name: Test
	run: swift test