build: shift Go support window to [1.20, 1.21] #295

	# Copyright The Notary Project Authors.
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

	name: Build

	on:
	push:
	branches: main
	pull_request:
	branches: main

	jobs:
	build:
	uses: ./.github/workflows/reusable-build.yml

Provide feedback