Replace golang.org/x/crypto/openpgp with github.com/ProtonMail/go-crypto #942
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The golang.org/x/crypto/openpgp library has been deprecated for over a year now (see https://golang.org/issue/44226, and the deprecation notice in the package documentation). The library is unmaintained and has a number of API and usability issues. ProtonMail maintains a community fork which is actively maintained, and for most cases is a drop-in replacement.
This change switches usages of golang.org/x/crypto/openpgp/... with github.com/ProtonMail/go-crypto/openpgp/..., the only other code changes are adding a nil packet.Config to a openpgp.CheckArmoredDetachedSignature call.
(This change is part of a wider effort by the Go Security team to remove usages of golang.org/x/crypto/openpgp from the Go ecosystem.)