update dependencies, including iPET

[svigerske]

requirements.txt and requirements-dev.txt defines explicit versions of Python package dependencies. For iPET, some version from end of 2019 is specified.
With these dependencies, I can get Rubberband to work with Python 3.6 (EOL many years ago), but not a current 3.12.
There are also several PR from dependabot that suggest updating dependencies in order to fix security issues.

Thus, one should see that dependencies get updated. Note, that IPET is very strict on the versions of its dependencies (https://github.com/GregorCH/ipet/blob/master/requirements.txt), with most of them also being a dependency of Rubberband.