feat: warn on vulnerable torch versions in fal run

[wennergr]

Adds a security warning in fal run when the app's requirements include a torch version <= 2.5, which has known serialization vulnerabilities allowing malicious model files to execute arbitrary code.

The warning also notes that a future release will automatically set weights_only=True on torch.load() calls for torch < 2.6 as a mitigation.

[wennergr]

Not convinced that this is the right place to put this warning (fal run)

╭─────────────────────────────── Security Warning ───────────────────────────────╮
│                                                                                │
│  Versions 2.5 and earlier of pytorch have a known serialization vulnerability  │
│  that may allow malicious model files to execute arbitrary code.               │
│                                                                                │
│  In a future release, fal will automatically set weights_only=True             │
│  on torch.load() calls for torch versions prior to 2.6 as a mitigation,        │
│  but upgrading to torch>=2.6 is strongly recommended.                          │
│                                                                                │
╰────────────────────────────────────────────────────────────────────────────────╯