test/utils/github_spec: filter further to fix test failure

[cho-m]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew typecheck with your changes locally?
• Have you successfully run brew tests with your changes locally?

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[cho-m]

For some reason, is: closed is giving me multiple results which doesn't match manual GitHub search. Currently, filtering on is: issue and no: milestone gives one result.

❯ brew ruby -e 'pp GitHub.search_issues("brew search", repo: "Homebrew/legacy-homebrew", author: "MikeMcQuaid", is: "closed").map { |out| out["title"] }'
["Shall we move more things to taps?",
 "upgrade: announce usage of --all.",
 "Remove (almost) everything",
 "Shall we run `brew update` automatically?",
 "bin/brew: move logic to Library.",
 "install: search when formula isn't found.",
 "Remove MD5 support.",
 "config: fail when HOMEBREW_BREW_FILE is unset.",
 "Use `(installed)` and emoji ticks consistently.",
 "Import docs from wiki."]

❯ brew ruby -e 'pp GitHub.search_issues("brew search", repo: "Homebrew/legacy-homebrew", author: "MikeMcQuaid", is: "issue").map { |out| out["title"] }'
["Shall we move more things to taps?", "Shall we run `brew update` automatically?"]

❯ brew ruby -e 'pp GitHub.search_issues("brew search", repo: "Homebrew/legacy-homebrew", author: "MikeMcQuaid", is: "issue", no: "milestone").map { |out| out["title"] }'
["Shall we move more things to taps?"]

[Bo98]

Thanks!

[MikeMcQuaid]

Thanks @cho-m!