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

Bump mozjs to 0.1.9

<!-- Please describe your changes on the following line: -->

Bumping rust-mozjs, which was updated in tandem ([here](servo/rust-mozjs@f966409)) with #19487, but the new version wasn't pulled in here.

r? @jdm

---
<!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `__` with appropriate data: -->
- [X] `./mach build -d` does not report any errors
- [X] `./mach test-tidy` does not report any errors
- [ ] These changes fix #__ (github issue number if applicable).

<!-- Either: -->
- [ ] There are tests for these changes OR
- [X] These changes do not require tests because it only bumps used crate minor version.

<!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.-->

<!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. -->

<!-- Reviewable:start -->
---
This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/19611)
<!-- Reviewable:end -->

components/script/Cargo.toml

@@ -65,7 +65,7 @@ metrics = {path = "../metrics"}
 mitochondria = "1.1.2"
 mime = "0.2.1"
 mime_guess = "1.8.0"
-mozjs = { version = "0.1.8", features = ["promises"]}
+mozjs = { version = "0.1.9", features = ["promises"]}
 msg = {path = "../msg"}
 net_traits = {path = "../net_traits"}
 nonzero = {path = "../nonzero"}