help request: support http2 and http1 at the same time after v3.9

[jzhao20230918]

Description

hello,

Does it mean all ports can only be http2 or http1.1 after v3.9? If I'd like port 9080 as http1.1 and port 9081 as http 2, how can I configure it as before? Thanks a lot.

Environment

• APISIX version (run apisix version):
• Operating system (run uname -a):
• OpenResty / Nginx version (run openresty -V or nginx -V):
• etcd version, if relevant (run curl http://127.0.0.1:9090/v1/server_info):
• APISIX Dashboard version, if relevant:
• Plugin runner version, for issues related to plugin runners:
• LuaRocks version, for installation issues (run luarocks --version):

[shreemaan-abhishek]

enable_http2: true