Auto merge of #24870 - pshaughn:2909, r=jdm

Fix #2909 (squashed version of PR #24865)

<!-- Please describe your changes on the following line: -->
Now using data-url::forgiving_base64 instead of base64, this fixes all the fetch/data-urls/base64.* tests.

---
<!-- 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 do not quite fix yet #2909

<!-- Either: -->
- [X] There are tests for these changes OR
- [ ] These changes do not require tests because ___

<!-- 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. -->

0 files changed, 0 insertions, 0 deletions