Switch to the newest http2 directive (#335)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Pete Cooper <[email protected]>
Co-authored-by: Léo Colombaro <[email protected]>

Author: 4 people

conf.d/.default.conf

@@ -12,8 +12,11 @@
 server {
   listen [::]:443 quic reuseport;
   listen 443 quic reuseport;
-  listen [::]:443 ssl http2 default_server;
-  listen 443 ssl http2 default_server;
+  listen [::]:443 ssl default_server;
+  listen 443 ssl default_server;
+
+  http2 on;
+  http3 on;
 
   server_name _;