servo: Merge #18449 - Remove get_location_with_offset (from tromey:remove-get_location_with_offset); r=jdm

Now that rust-cssparser reports 1-based locations, bump the required
cssparser version and remove get_location_with_offset.  Previously,
some code paths were not calling get_location_with_offset; see
https://bugzilla.mozilla.org/show_bug.cgi?id=1398869 for some
background.

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<!-- 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
- [x] These changes fix https://bugzilla.mozilla.org/show_bug.cgi?id=1398869 (github issue number if applicable).

<!-- Either: -->
- [ ] There are tests for these changes OR
- [x] These changes do not require tests because tests are in rust-cssparser and/or M-C

Source-Repo: https://github.com/servo/servo
Source-Revision: 7746896bc4cf5a2a6dc78c00f643e4cff8e49da4

--HG--
extra : subtree_source : https%3A//hg.mozilla.org/projects/converted-servo-linear
extra : subtree_revision : 919aeee03abfd07cd5dbcc9d478dd98cc76f054e