Auto merge of #19611 - Xanewok:bump-mozjs, r=jdm

Bump mozjs to 0.1.9

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Bumping rust-mozjs, which was updated in tandem ([here](https://github.com/servo/rust-mozjs/commit/f9664091b1cd6f26b58d7ba6792a16fc83376ce0)) with https://github.com/servo/servo/pull/19487, but the new version wasn't pulled in here.

r? @jdm

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