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GH-15007: [CI][RPM] Ignore import failed key (#15008)

I don't know why but the following key can't be imported by RPM ("rpmkeys --import"):

almalinux-8-amd64:

https://github.com/ursacomputing/crossbow/actions/runs/3711543280/jobs/6292083831#step:9:578

    Importing GPG key 0x3790810C:
     Userid     : "Raphael Jaen Taylor-Davies <r.taylordavies@ googlemail.com>"
     Fingerprint: B90E B64A 3AF1 5545 EC8A 7B88 03F0 D5EA 3790 810C
     From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-Apache-Arrow

It may be related to
https://bugzilla.redhat.com/show_bug.cgi?id=1941098 but I don't know the real problem...
* Closes: #15007

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>