Auto merge of #17085 - aneeshusa:fix-mach-upload-nightly-for-macbrew, r=larsbergstrom

Fix `./mach upload-nightly macbrew`

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Fix a few issues with the Homebrew repository updating.
Follow-up to #16565; should finish off #17045.

Lightly smoke-tested locally this time.

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- [ ] These changes fix #__ (github issue number if applicable).

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