Changes needed for new release (3.11.5)

Hello. gpodder has released 3.11.5 and due to the changes made in the move from setup.py to pyproject.toml style packaging, now building the package needs python-build and python-installer.

Also the gpodder-3_11_4-fix-imp-module.patch is merged in the new release and is no longer needed to be applied here.

I don't know if this falls under General guidelines

Do not create merge requests for trivial package updates

If desired I can submit a merge request with these changes.

in summary:

• Add python-build and python-installer to makedepends.
• Add python-pysocks as optional dependency for SOCKS proxy support.
• Remove the imp patch since it is merged in the new release.