gstlal 1.13.0, Ubuntu 24.04 (Python 3.12): No module named 'imp'

https://hypatia.aei.mpg.de/lsc-amd64-noble/gstlal_1.13.0-1.01+ubuntu24.04.0_amd64.--pbuilderlog

The imp module has been removed by Python 3.12 - the official suggestion is to use importlib instead (but I have no real idea how).

Two files seem to be affected: python/bottle.py (L38) and gnuscripts/py-compile (L119, L140)

• the former uses imp.new_module(), for which https://docs.python.domainunion.de/3.11/library/imp.html suggests to "[u]se importlib.util.module_from_spec() instead"
• the latter imp.cache_from_source(), to be replaced with "importlib.util.cache_from_source() instead", according to the same page.

Patches are welcome.