Backport PR #28357 on branch 0.25.x (Change conda channel order for Windows builds)
Backport PR #28357: Change conda channel order for Windows builds
CI is failing, but going to merge this:

- No idea why the style check is failing, but it's not related to this PR, so will fix separately
- The travis failures are related to S3, which is being handled in the other backport PR (and the other one is failing due to the failure that is being fixed in this PR) Ah, the flake8 error is also fixed in https://github.com/pandas-dev/pandas/pull/28615