fix: Update golang.org/x/mod, fix problems with go1.21.0. #284

	name: go

	on:
	push:
	branches:
	- master
	tags:
	pull_request:

	jobs:
	lint:
	runs-on: ubuntu-latest
	name: Linters (Static Analysis) for Go
	steps:
	- name: Checkout code into the Go module directory.
	uses: actions/checkout@v3

	- name: Install Go
	uses: actions/setup-go@v3
	with:
	go-version: 1.18.x

	- uses: actions/cache@v3
	with:
	path: ~/go/pkg/mod
	key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}

	- name: Linting & vetting.
	env:
	GOBIN: /tmp/.bin
	run: make lint
	tests:
	runs-on: ${{ matrix.platform }}
	strategy:
	fail-fast: false
	matrix:
	go: ['1.17.x', '1.18.x', '1.19.x', '1.20.x']
	platform: [ubuntu-latest, macos-latest]

	name: Unit tests on Go ${{ matrix.go }} ${{ matrix.platform }}
	steps:
	- name: Checkout code into the Go module directory.
	uses: actions/checkout@v3

	- name: Install Go
	uses: actions/setup-go@v3
	with:
	go-version: ${{ matrix.go }}

	- uses: actions/cache@v3
	with:
	path: ~/go/pkg/mod
	key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}

	- name: Run unit tests.
	env:
	GOBIN: /tmp/.bin
	run: make test

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