Update to requirements.txt

[AllanJard]

I wanted to have a little "play" with video to line scan photos - so thank you for making this available!

I thought I'd write down the little tweak I used to make it work on my OpenSUSE tumbleweed system (although I suspect it will be the same on other distros).

Requirements.txt updated to be:

numpy==1.24.3
matplotlib==3.7.1
progressbar2==3.55.0
opencv-python==4.7.0.72

and in main.py replace set_window_title with setWindowTitle for the updated API. Then it runs beautifully.