[Release][C++] Enable mimalloc in the windows verification script

[asfimport]

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

PRs and other links:

• GitHub Pull Request #9247

_{Note: This issue was originally created as ARROW-11303. Please see the migration documentation for further details.}

[asfimport]

Kouhei Sutou / @kou:
Issue resolved by pull request 9247
#9247