Rename pyqt5 package as per Homebrwe (backport #4241)

[mergify]

Like brew says, Warning: Formula pyqt5 was renamed to pyqt@5.

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This is an automatic backport of pull request #4241 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of bd8e984 has failed:

On branch mergify/bp/iron/pr-4241
Your branch is up to date with 'origin/iron'.

You are currently cherry-picking commit bd8e984e.
  (fix conflicts and run "git cherry-pick --continue")
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  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
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	both modified:   source/Installation/Alternatives/macOS-Development-Setup.rst

no changes added to commit (use "git add" and/or "git commit -a")

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