quic-status header now uses $http3 variable

    The value of $http3 is "h3" for HTTP/3 connections,
    "hq" for hq connections, or an empty string otherwise.

.github/workflows/dockerimage.yml

@@ -83,7 +83,7 @@ jobs:
         grep --fixed-strings '< HTTP/3 200' /tmp/h3
         grep --fixed-strings --invert-match -i '< server: nginx' /tmp/h3 > /dev/null
         grep --fixed-strings '< alt-svc: h3-27=":8889"; ma=86400, h3-28=":8889"; ma=86400, h3-29=":8889"; ma=86400' /tmp/h3
-        grep --fixed-strings '< quic-status: quic' /tmp/h3
+        grep --fixed-strings '< quic-status: h3' /tmp/h3
         grep --fixed-strings '<p>It works!</p>' /tmp/h3
 
         docker logs test_nginx