djongo 1.3.7 isn't compatible with any version of Django past 3.1.12, but djongo 1.3.6 brings no problem

When trying to install `djongo==1.3.7` with `Django>=4.1,<4.2`, I get this error:
```
The conflict is caused by:
    The user requested Django<4.2 and >=4.1
    djongo 1.3.7 depends on django<=3.1.12 and >=2.1
```

This seems to contradict https://github.com/doableware/djongo/pull/615