Bug 1503377 [wpt PR 13791] - Add signed-exchange/META.yml (suggested reviewers), a=testonly

Automatic update from web-platform-testsAdd signed-exchange/META.yml (suggested reviewers) (#13791)

--

wpt-commits: 5d1aee150ce0201b883c31dee60ba23b0e7c633e
wpt-pr: 13791

testing/web-platform/tests/signed-exchange/META.yml

@@ -0,0 +1,5 @@
+spec: https://wicg.github.io/webpackage/draft-yasskin-http-origin-signed-responses.html
+suggested_reviewers:
+  - irori
+  - jyasskin
+  - nyaxt