Pin Django version

[tymees]

To my suprise, we're not pinning Django to a specific version. I guess this works because we're running the compile on Python 3.9 (which only supports Django up to version 4.2). We probably should pin it to that minor version

[bbonf]

Closed in 56f4fa4222f3132693fc36c0d20a71aa77f8c4db