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ARROW-11242: [CI] Remove CMake 3.2 job

Because we dropped support for CMake 3.2.

Closes #9198 from kou/ci-remove-cmake-3.2

Lead-authored-by: Sutou Kouhei <kou@clear-code.com>
Co-authored-by: Krisztián Szűcs <szucs.krisztian@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>