Update go116 to 1.16.1, fixing two security issues:

  - encoding/xml: infinite loop when using xml.NewTokenDecoder with a
  custom TokenReader

The Decode, DecodeElement, and Skip methods of an xml.Decoder provided by
xml.NewTokenDecoder may enter an infinite loop when operating on a custom
xml.TokenReader which returns an EOF in the middle of an open XML element.

Thanks to Sam Whited for reporting this issue.

This issue is CVE-2021-27918 and Go issue golang.org/issue/44913.

  - archive/zip: panic when calling Reader.Open

The Reader.Open API, new in Go 1.16, will panic when used on a ZIP archive
containing files that start with "../".

This issue is CVE-2021-27919 and Go issue golang.org/issue/44916.

(bsiegert)