Jenn Magder 19aaa2d2da Stop specifiying Macmini8,1 in ci builders, use inherited mac_model dimension (flutter/engine#41223)
As of https://github.com/flutter/engine/pull/41219 all the .ci.yaml builders will run on either Macmini8,1 (x64) or Macmini9,1 (arm).  Stop specifying `Macmini8,1` on individual builders and let the specified architecture be the deciding factor.

Reverts #41203
2023-05-02 17:37:51 +00:00
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