Fix location of Homebrew tap (rebased onto dev_4_4)



This is the same as gh-2366 but rebased onto dev_4_4.

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With https://github.com/Homebrew/homebrew/commit/e07584e3fbdc88327bafe23b9c40c904d0fff0a1, the location of the Homebrew taps has been modified.  Consequently the local `scc merge` operation fails in the daily Homebrew job. This single commit should restore the job.
To test it, check the next occurence of the job is green.

Note: this PR will be rebased onto `develop` and `dev_4_4`.