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ARROW-11411: [Packaging][Linux] Disable arm64 nightly builds

We'll re-enable them with new CI configuration by the next release.

Closes #9346 from kou/packaging-linux-disable-arm64

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