Auto merge of #16306 - ahmedcharles:msvc, r=Wafflespeanut

Update Cargo.lock to include fix for MSVC 2017 in mozjs-sys.

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

---
<!-- 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

<!-- Either: -->
- [X] These changes do not require tests because it just updates to a new version of spidermonkey.

<!-- 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/16306)
<!-- Reviewable:end -->

Cargo.lock

@@ -1649,7 +1649,7 @@ dependencies = [
 [[package]]
 name = "mozjs_sys"
 version = "0.0.0"
-source = "git+https://github.com/servo/mozjs#7cd72d8c8f44f43ba162bdd814ec85e81b79cfb4"
+source = "git+https://github.com/servo/mozjs#29132f6790dd0c066f10fc398a7071f6a5b6bc65"
 dependencies = [
  "libc 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "libz-sys 1.0.13 (registry+https://github.com/rust-lang/crates.io-index)",