Bug 1866314: set timeout to "long" for <fetchpriority.h2.html> test suite. r=necko-reviewers,kershaw DONTBUILD

Especially required for the TSan run. See above mentioned bug. With this patch, the TSan run passes on Try: https://treeherder.mozilla.org/jobs?repo=try&revision=729ddbbbe0b6c176bfc2d1897d8d05f806f1e8b9 Differential Revision: https://phabricator.services.mozilla.com/D194757
2023-11-28 08:40:32 +00:00 · 2023-11-28 08:40:32 +00:00 · 7bc5667280
--- a/testing/web-platform/mozilla/tests/fetch/fetchpriority/fetchpriority.h2.html
+++ b/testing/web-platform/mozilla/tests/fetch/fetchpriority/fetchpriority.h2.html
@ -2,6 +2,7 @@
 <html>
 <head>
  <meta charset="UTF-8">
+  <meta name="timeout" content="long">
  <title>fetchpriority: internal priorities of corresponding http-on-opening-requests</title>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>