Auto merge of #29841 - mrobinson:update-mozjs, r=jdm

Update mozjs to get new mach version

The mozjs repository now has a version of mach that works more consistently with newer versions of Python.

Fixes #29142.

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #29142
- [x] These changes do not require tests

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