Auto merge of #25377 - marmeladema:issue-23607/test-wpt, r=jdm

Run eventsource wpt tests with Python3

I deliberately changed the CI to run the WPT tests using Python3 to see if it works.
Even if we don't want to change the CI right now, the first commit with only the python requirements update can be merged.

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors

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