Fix some more Rails 7.3 references

Author: byroot

railties/lib/rails/application/configuration.rb

@@ -367,11 +367,11 @@ def enable_reloading=(value)
       end
 
       def read_encrypted_secrets
-        Rails.deprecator.warn("'config.read_encrypted_secrets' is deprecated and will be removed in Rails 7.3.")
+        Rails.deprecator.warn("'config.read_encrypted_secrets' is deprecated and will be removed in Rails 8.0.")
       end
 
       def read_encrypted_secrets=(value)
-        Rails.deprecator.warn("'config.read_encrypted_secrets=' is deprecated and will be removed in Rails 7.3.")
+        Rails.deprecator.warn("'config.read_encrypted_secrets=' is deprecated and will be removed in Rails 8.0.")
       end
 
       def encoding=(value)