Auto merge of #15005 - aneeshusa:fix-git-author-setting-for-brew-upload, r=jdm
Auto merge of #15005 - aneeshusa:fix-git-author-setting-for-brew-upload, r=jdm

Fix git author setting for brew upload

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The fix from #14935 wasn't quite right.

cc @paulrouget

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- [ ] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix servo/saltfs#575 properly (github issue number if applicable).

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- [ ] There are tests for these changes OR
- [x] These changes do not require tests because they should be tested by running the mac-nightly builder

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