Install Pillow on pypy-3.9 and windows-latest fails

```
The headers or library files could not be found for zlib,
a required dependency when compiling Pillow from source.
```

https://github.com/scito/extract_otp_secret_keys/actions/runs/3726606340/jobs/6320167828#step:4:264

Workaround for ci: exclude pypy-3.9 and windows-latest

https://pillow.readthedocs.io/en/latest/installation.html