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ARROW-7247: [CI][Python] Fix wheel build error on macOS

    dyld: Library not loaded: /usr/local/opt/openssl/lib/libssl.1.0.0.dylib
      Referenced from: /usr/local/bin/wget
      Reason: image not found

Closes #5887 from kou/ci-python-wheel-macos and squashes the following commits:

4f8532712 <Sutou Kouhei>  Fix wheel build error on macOS

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