jobs/swh-packages: Bump Python to 3.10 for listers and loaders builds
Listers and loaders are now running with Python 3.10 in production so we can bump Python version for the build of these packages on Jenkins.
Staging instance, all changes can be removed at any time
Listers and loaders are now running with Python 3.10 in production so we can bump Python version for the build of these packages on Jenkins.