Log Message:
gh: Update to 2.20.2

pkgsrc changes:
 - G/C custom do-build target: we can (ab)use GO_BUILD_PATTERN to inject custom
   `-ldflags' (pretty common pattern among several Go packages)

Changes:
2.20.2
======
What's Changed
--------------
  * Fix up Linux packaging regression by @samcoe in #6621

2.20.1
======
What's Changed
--------------
  * Update security policy by @maclarel in #6587
  * Fix listing repositories for a named GitHub user
  * Fix commands not properly refreshing the terminal screen

2.20.0
======
What's New
----------
  * New gh extension browse command:
    List, filter, and install available gh extensions from GitHub.com using an
    interactive interface.
  * New gh extension search command:
    Search GitHub.com repositories that have the gh-extension topic.

What's Changed
--------------
  * Internal: add instructions for adding protocol buffers

2.19.0
======
What's New
----------
  * Support explicitly marking a Release as "Latest"
    Example:
      gh release create v1.3.0 --latest --target=main --notes ""
      gh release create v1.2.1 --latest=false --target=1.2-stable --notes \ 
""
  * New gh issue develop command for managing branches linked to an issue
    Example:
      gh issue develop 123 --checkout
      #=> remotely generates a branch linked to issue #123 and checks it out \ 
locally
  * Add gh release download --output flag for downloading a single asset
    Example:
      gh release download --archive=tar.gz --output - | tar xz
  * run list: add number field to JSON export
  * run view: add jobs field to JSON export
  * repo list --topic flag now accepts multiple topics
  * codespace rebuild: perform incremental rebuild by default, add --full for
    full rebuild
  * extension upgrade --force overrides the pinned state of extensions

What's Changed
--------------
  * pr create -R <repo> -H <branch>: enable use from outside of a \ 
local git
    repo
  * codespace ssh: avoid timing out waiting for the codespace to start
  * release create: avoid duplicate release when uploading assets
  * extension create: upgrade template for actions/checkout@v3
  * tablerow template helper: fix measuring available width when
    GH_FORCE_TTY=100% and output redirection are used
  * Document the hyperlink template helper
  * Fix NO_COLOR setting not respected in gh upgrade notice
  * gpg-key add: explain in error message how to convert keys into
    ASCII-armored format for uploading
  * repo list: fix listing when belonging to org with IP Allow list
  * auth: fix setting up git credential helper for some Windows paths
  * Auth error messsage in Actions now suggests using github.token instead of
    secrets.GITHUB_TOKEN
  * Dogfood the term package from go-gh library
  * Improve resolving SSH hostname aliases from git remotes
  * Normalize the Time-Zone headers in tests
  * Refactor the git client
  * Add support for the internal garage.github.com host
  * Bump microsoft/setup-msbuild from 1.0.3 to 1.1.3