[Packaging][Python] Fix conda linux and OSX wheel nightly builds

[asfimport]

Reporter: Krisztian Szucs / @kszucs
Assignee: Krisztian Szucs / @kszucs

PRs and other links:

• GitHub Pull Request #5647

_{Note: This issue was originally created as ARROW-6937. Please see the migration documentation for further details.}

[asfimport]

Krisztian Szucs / @kszucs:
Issue resolved by pull request 5647
#5647