Update to Playwright 1.42

[tmbrbr]

This PR merges the upstream firefox version:

• Firefox v121.0, specifically: a32b8662993085139ac91212a297123b632fc1c0
• Playwright 1.42: https://github.com/microsoft/playwright/tree/release-1.42

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[tmbrbr]

There were a few things to fix in this PR, mainly there were some crashes related to the garbage collection / double free of some strings.

For Strings created in the Nursery, the memory is not explicitly freed during a garbage collection, the long-lived strings are migrated, and the entire Nursery is zapped. As the tainting information is managed separately, we need to explicitly free it during a sweep. This was working but had been removed a few versions ago.

I also found a case where inline strings were created as dependent strings where a lack of GC blocking was causing problems.

[tmbrbr]

There still seems to be some memory related crashes which need to be fixed before this PR can be submitted.