tests/functional/test_ppc64_hv: Update repo management

`setup-apkrepos` can be used to set repos rather than open-coding URLs.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Message-ID: <20241220024617.1968556-4-npiggin@gmail.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
1 file changed