chore: bump go.mod to Go 1.20 and run go fix #614

	on: [push, pull_request]
	name: Go Test (go-ipld-prime custom)

	# Similar to go-test.yml but runs only on Linux and doesn't run tests with
	# coverpkg so we can properly execute the codegen behavior tests which are
	# skipped in go-test.yml execution.

	jobs:
	unit:
	strategy:
	fail-fast: false
	matrix:
	os: [ "ubuntu" ]
	go: [ "1.17.x", "1.18.x" ]
	runs-on: ${{ format('{0}-latest', matrix.os) }}
	name: ${{ matrix.os }} (go ${{ matrix.go }})
	steps:
	- uses: actions/checkout@v2
	with:
	submodules: recursive
	- uses: actions/setup-go@v2
	with:
	go-version: ${{ matrix.go }}
	- name: Go information
	run: \|
	go version
	go env
	- name: Run tests
	uses: protocol/multiple-go-modules@v1.2
	with:
	run: \|
	go test -v ./...

Provide feedback