ci: initialize const max_args_count / max_args_bytes in ctor

Matching half of the const-member additions in webserver.hpp from
2e803ed. gcc 13 (CodeQL on Ubuntu 24.04) refuses to default-construct
a const std::size_t member without an initializer; clang/macOS happened
to accept the missing initializer silently. Add the two init-list lines
in declaration order, between max_thread_stack_size and use_ssl, so the
constructor matches the field layout.

Author: etr

src/webserver.cpp

@@ -200,6 +200,8 @@ webserver::webserver(const create_webserver& params):
     bind_address(params._bind_address),
     bind_address_storage(params._bind_address_storage),
     max_thread_stack_size(params._max_thread_stack_size),
+    max_args_count(params._max_args_count),
+    max_args_bytes(params._max_args_bytes),
     use_ssl(params._use_ssl),
     use_ipv6(params._use_ipv6),
     use_dual_stack(params._use_dual_stack),