tests/vm: update centos.aarch64 image to 9

As Centos Stream 8 goes out of support we need to update. To do this
powertools is replaced by crb and we don't over specify the python3 we
want.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20240603175328.3823123-4-alex.bennee@linaro.org>
1 file changed