Fix deprecation warning

It set Rails.application.config.active_record.legacy_connection_handling to false, as would Rails 6.1 default do. This removes a deprecation warning showing up each time tests are run, and enables granular connection swapping (which we do not use currently, but this may change in the future).

config/application.rb

@@ -64,6 +64,14 @@ module OpenProject
     # files. See https://community.openproject.org/wp/45463 for details.
     # config.load_defaults 5.0
 
+    # Use new connection handling API. For most applications this won't have any
+    # effect. For applications using multiple databases, this new API provides
+    # support for granular connection swapping.
+    # It has to be done here to prevent having the deprecation warning
+    # displayed. This line and its comment can safely be removed
+    # once `config.load_defaults 6.1` is used.
+    config.active_record.legacy_connection_handling = false
+
     # Sets up logging for STDOUT and configures the default logger formatter
     # so that all environments receive level and timestamp information
     #

config/initializers/new_framework_defaults_6_1.rb

@@ -57,8 +57,8 @@
 # Use new connection handling API. For most applications this won't have any
 # effect. For applications using multiple databases, this new API provides
 # support for granular connection swapping.
-# Previous versions had false. Rails 6.1+ default is true.
-# Rails.application.config.active_record.legacy_connection_handling = false
+# Previous versions had true. Rails 6.1+ default is false.
+Rails.application.config.active_record.legacy_connection_handling = false
 
 # https://guides.rubyonrails.org/configuring.html#config-action-view-form-with-generates-remote-forms
 # Make `form_with` generate non-remote forms by default.