Update pgap.py

[iskold]

Converted problematic strings to raw strings to avoid syntax warnings with Python 3.12+

[azat-badretdin]

Thank you very much for your contribution, John!

We will start an internal process of reviewing this PR soon

[juansebe1]

Hello! I already converted problematic strings to raw strings on the lines 133, 978 and 1109 but, when I try to run the annotation script, ./pgap.py updates and the same errors appear again

How can I solve this? Thanks

[george-coulouris]

@juansebe1, specify the --no-self-update option.