Update apt GPG file name to wikimedia-$SUITE
"wikimedia-bookworm.pub.gpg" works for the bookworm wmf-debci image, but the e.g. bullseye variant requires "wikimedia-bullseye.pub.gpg".
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"wikimedia-bookworm.pub.gpg" works for the bookworm wmf-debci image, but the e.g. bullseye variant requires "wikimedia-bullseye.pub.gpg".