Conda channels are in wrong order in Windows Tests on Azure
We currently have https://github.com/pandas-dev/pandas/blob/df3d9b2cdfe2ebab3a5b22e6f5359a393e519af4/ci/deps/azure-windows-36.yaml#L2-L4 for the requirements in the Windows tests. This is sadly a known source for problems as there are conflicting packages in both channels, e.g. boost from `defaults` and `conda-forge` is in different packages (`libboost` vs `boost-cpp`) and thus both can be installed while one is overriding the other (for boost this is fixed but there are several other packages). See also https://conda-forge.org/docs/user/tipsandtricks.html#multiple-channels for another explanation. The wrong order is probably a source of issues like https://github.com/pandas-dev/pandas/issues/23180