Bump to Go 1.25

[n0vad3v]

• Bump to Go 1.25
• Bump image version from bookworm to trixie, libjxl version can be bumped to 0.11.x to gain performance improvements (https://github.com/libjxl/libjxl, https://cloudinary.com/blog/jpeg-xl-and-the-pareto-front)

[github-actions]

Report Summary

┌──────────────────────────────────────────────┬──────────┬─────────────────┬─────────┐
│                    Target                    │   Type   │ Vulnerabilities │ Secrets │
├──────────────────────────────────────────────┼──────────┼─────────────────┼─────────┤
│ ghcr.io/webp-sh/webp_server_go (debian 13.0) │  debian  │        0        │    -    │
├──────────────────────────────────────────────┼──────────┼─────────────────┼─────────┤
│ usr/bin/webp-server                          │ gobinary │        0        │    -    │
└──────────────────────────────────────────────┴──────────┴─────────────────┴─────────┘
Legend:
- '-': Not scanned
- '0': Clean (no security findings detected)