Drop support for Windows x86: cryptography version => 49.0 does not have support anymore for Windows x86

See https://cryptography.io/_/downloads/en/stable/pdf/:

```
2.10.2 49.0.0 - 2026-06-12
• BACKWARDS INCOMPATIBLE: Support for 32-bit Windows has been removed. Users should move to a
64-bit Python installation.
```

This means that we have two options going forward:

1. Drop support for x86 now
2. Keep support for x86 using a pinned cryptography to version < 49.0