textproc/zxing-cpp: update to 3.1.1 release (+)

This update is requirement for upcoming LibreOffice 26.8 branch

Release notes: https://github.com/zxing-cpp/zxing-cpp/releases/tag/v3.1.0 \

		https://github.com/zxing-cpp/zxing-cpp/releases/tag/v3.1.1

With hat: office