ARROW-10081: [C++/Python] Fix bash syntax in drone.io conda builds
ARROW-10081: [C++/Python] Fix bash syntax in drone.io conda builds

Closes #8257 from xhochy/ARROW-10081

Authored-by: Uwe L. Korn <5f6f0a63dee51498bdd8036770b3bad30ce7a5ac@quantco.com>
Signed-off-by: Uwe L. Korn <5f6f0a63dee51498bdd8036770b3bad30ce7a5ac@quantco.com>

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