[ruby/net-http] Need to restore under the Net namespace

https://github.com/ruby/net-http/commit/4650f86981

lib/net/http.rb

@@ -738,12 +738,6 @@ module Net   #:nodoc:
     rescue LoadError
       HAVE_ZLIB=false
     end
-
-    # for backward compatibility until Ruby 3.5
-    # https://bugs.ruby-lang.org/issues/20900
-    # https://github.com/bblimke/webmock/pull/1081
-    HTTPSession = HTTP
-    deprecate_constant :HTTPSession
     # :startdoc:
 
     # Returns +true+; retained for compatibility.
@@ -2565,6 +2559,11 @@ module Net   #:nodoc:
     alias_method :D, :debug
   end
 
+  # for backward compatibility until Ruby 3.5
+  # https://bugs.ruby-lang.org/issues/20900
+  # https://github.com/bblimke/webmock/pull/1081
+  HTTPSession = HTTP
+  deprecate_constant :HTTPSession
 end
 
 require_relative 'http/exceptions'