Update all pinned dependency versions; fix cffi/cryptography conflict

[Copilot]

Description

cryptography==46.0.5 requires cffi>=2.0.0, but requirements pin cffi==1.17.1, causing pip resolution failure in CI.

Updated all pinned dependencies to latest across every requirements file:

• requirements.txt: cffi 1.17.1→2.0.0, pycparser 2.22→3.0, Pillow 10.4.0→12.1.1, qrcode 7.3.1→8.2, pyopenssl 25.1.0→25.3.0, typing_extensions 4.14.1→4.15.0, certifi 2025.7.14→2026.2.25, smbus2 0.4.3→0.6.0
• requirements-raspi.txt: spidev 3.5→3.8
• requirements-desktop.txt: pygame 2.5.2→2.6.1, numpy 2.2.6→2.4.3, opencv-python 4.12.0.88→4.13.0.92
• tests/requirements.txt: pytest 7.4.2→9.0.2, pytest-cov 4.1.0→7.0.0, coverage 7.6.12→7.13.4, iniconfig 2.1.0→2.3.0, packaging 25.0→26.0, exceptiongroup 1.3.0→1.3.1, tomli 2.2.1→2.4.0, importlib-metadata 8.7.0→8.7.1, typing-extensions 4.14.1→4.15.0
• l10n/requirements-l10n.txt: Babel 2.16.0→2.18.0

pytest 9 removed support for the deprecated path: py.path.local hook parameter. Fixed pytest_ignore_collect in tests/screenshot_generator/conftest.py to use collection_path:

# Before (pytest ≤8)
def pytest_ignore_collect(path, config):

# After (pytest 9+)
def pytest_ignore_collect(collection_path, config):

No screenshots — dependency-only changes plus a one-line pytest hook fix.

This pull request is categorized as a:

• New feature
• Bug fix
• Code refactor
• Documentation
• Other

Checklist

• I've run pytest and made sure all unit tests pass before sumbitting the PR

If you modified or added functionality/workflow, did you add new unit tests?

• No, I'm a fool
• Yes
• N/A

I have tested this PR on the following platforms/os:

• Raspberry Pi OS Manual Build
• SeedSigner OS on a Pi0/Pi0W board
• Other

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