Tests: adjusted connect timeout in HTTP/2 tests.

lib/Test/Nginx/HTTP2.pm

diff --git a/lib/Test/Nginx/HTTP2.pm b/lib/Test/Nginx/HTTP2.pm
index 2e02baa..d35937c 100644
--- a/lib/Test/Nginx/HTTP2.pm
+++ b/lib/Test/Nginx/HTTP2.pm
@@ -501,7 +501,7 @@
 	eval {
 		local $SIG{ALRM} = sub { die "timeout\n" };
 		local $SIG{PIPE} = sub { die "sigpipe\n" };
-		alarm(2);
+		alarm(5);
 		$s = IO::Socket::INET->new(
 			Proto => 'tcp',
 			PeerAddr => "127.0.0.1:$port",