graphics/vigra: update to 1.12.1

ChangeLog: https://github.com/ukoethe/vigra/releases/tag/Version-1-12-1

Accumulated changes:

• Address implementation incompatibility of ptp in vigranumpy with numpy 2
• Improve compatibility with compilers in 2024.
• Update testing infrastructure to use modern packages from conda-forge.

Reported by: portscout