cfssl: update to 1.6.4

Pkgsrc changes:

* Update MAINTAINER mail address.

Upstream changes:

* Add support to multi architecture docker image using a github action
* Binary enablement for s390x
* Improve IPv6 address handling in ocspserve
* Make api intro.txt references links
* Update Dockerfile
* Update Makefile
* add arm64 on all linux binaries
* all: gofmt for go1.18 (fixes missing build-tags)
* api: replace uses of deprecated io/ioutil
* auth: replace uses of deprecated io/ioutil
* build(deps): bump golang.org/x/net from 0.2.0 to 0.7.0
* bundler: replace uses of deprecated io/ioutil
* certdb: replace uses of deprecated io/ioutil
* certinfo: replace uses of deprecated io/ioutil
* cli: replace uses of deprecated io/ioutil
* cmd: replace uses of deprecated io/ioutil
* config: replace uses of deprecated io/ioutil
* crl: replace uses of deprecated io/ioutil
* csr: replace uses of deprecated io/ioutil
* doc: remove mention of deprecated io/ioutil
* go.mod: github.com/cloudflare/redoctober v0.0.0-20211013234631-6a74ccc611f6
* go.mod: github.com/google/certificate-transparency-go v1.1.4
* go.mod: github.com/jmhodges/clock v1.2.0
* go.mod: github.com/matttproud/golang_protobuf_extensions v1.0.2
* go.mod: golang.org/x/crypto v0.3.0
* go.mod: golang.org/x/net v0.2.0
* go.mod: tidy and vendor with go1.18
* helpers/derhelpers: remove support for go1.12
* helpers: replace uses of deprecated io/ioutil
* include linux/arm64 in builds
* initca: replace uses of deprecated io/ioutil
* multiroot: replace uses of deprecated io/ioutil
* ocsp: replace uses of deprecated io/ioutil
* push images to github/docker container registry
* remove deprecated golint (golang.org/x/lint)
* remove docker socket volume mount
* remove external linker in linux builds
* remove privileged argument from docker runs
* remove use of obsolete golang.org/x/net/context package
* revoke: replace uses of deprecated io/ioutil
* scan: replace uses of deprecated io/ioutil
* selfsign: replace uses of deprecated io/ioutil
* signer: replace uses of deprecated io/ioutil
* transport/ca/localca: New(): return error instead of calling os.Exit(1)
* transport/ca/localca: remove unused testGenerateKeypair utility
* transport/ca/localca: remove uses of deprecated io/ioutil
* transport/ca/localca: remove uses of github.com/kisom/goutils/assert
* transport: replace uses of deprecated io/ioutil
* ubiquity: replace uses of deprecated io/ioutil
* use cgo only in darwin builds
* use gythialy/golang-cross for snapshot builds
* whitelist: replace uses of deprecated io/ioutil

(iquiw)