web-platform-tests/wpt merge_pr_48704

on GitHub

Fix strings within GitHub Actions workflow expressions

https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/evaluate-expressions-in-workflows-and-actions#literals:

You don't need to enclose strings in ${{ and }}. However, if you do,
you must use single quotes (') around the string. To use a literal
single quote, escape the literal single quote using an additional
single quote (''). Wrapping with double quotes (") will throw an
error.

And in a shocking turn of events, using double quotes did in fact
throw an error.