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Sutou Kouhei authored and GitHub committed c9a09b05027
GH-33800: [Packaging] Drop support for Ubuntu 18.04 (#34020) ### Rationale for this change Ubuntu 18.04 will reach End of Standard Support on 2023-04: https://wiki.ubuntu.com/Releases > Version | Code name | Docs | Release | End of Standard Support | End of Life > -- | -- | -- | -- | -- | -- > Ubuntu 18.04.6 LTS | Bionic Beaver | Changes | September 17.2021 | April 2023 | April 2028 ### What changes are included in this PR? Remove Ubuntu 18.04 related things. ### Are these changes tested? Yes. ### Are there any user-facing changes? Yes. * Closes: #33800 Authored-by: Sutou Kouhei <kou@clear-code.com> Signed-off-by: Sutou Kouhei <kou@clear-code.com>