Describe the bug
Links sent in emails are getting doubly encoded.

For example:
http://localhost:9000/if/flow/signup/?query=&flow_token=W2kRqeEmVIdh0h...

The issue is the & between querystring parameters.

To Reproduce
Steps to reproduce the behavior:

I'm seeing these on all signup flows and reset password flows where an email is triggered.

Expected behavior
I'd expect the above to instead be
http://localhost:9000/if/flow/signup/?query=&flow_token=W2kRqeEmVIdh0h...

Version and Deployment (please complete the following information):

• authentik version: 2023.10.2
• Deployment: only tested so far in docker-compose