`request-method` trigger field works incorrectly in Safari 26

[ameshkov]

We filed a bug report to WebKit:
https://bugs.webkit.org/show_bug.cgi?id=305476

Opening this issue as a reminder to not forget to check when the issue is fixed in Safari.

Once it's fixed we should change metadata for tests here:
https://testcases.agrd.dev/Filters/method-rules/test-method-rules