Cache local brew taps on self-hosted darwin runner

[at-wat]

first time second time (cached)

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (aca3ee9) 59.02% compared to head (a85cebc) 59.02%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #514 +/- ## ======================================= Coverage 59.02% 59.02% ======================================= Files 63 63 Lines 3854 3854 ======================================= Hits 2275 2275 Misses 1446 1446 Partials 133 133 ```

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