ARROW-7612: [Packaging][Python] Fix artifacts path for Conda on Windows

See the following for real path:

https://dev.azure.com/ursa-labs/2a3e076a-0cff-409a-87ab-3f3adb390ea7/_apis/build/builds/4988/logs/13

    2020-01-17T09:56:43.7023218Z # If you want to upload package(s) to anaconda.org later, type:
    2020-01-17T09:56:43.7023307Z
    2020-01-17T09:56:43.7023432Z anaconda upload D:\bld\win-64\arrow-cpp-0.15.0.dev606-py37h3b6a26a_0.tar.bz2
    2020-01-17T09:56:43.7023526Z anaconda upload D:\bld\win-64\parquet-cpp-1.5.1-0.tar.bz2
    2020-01-17T09:56:43.7023659Z anaconda upload D:\bld\win-64\pyarrow-0.15.0.dev606-py37h803c963_0.tar.bz2

Closes apache#6226 from kou/packaging-conda-windows-fix-artifacts-path and squashes the following commits:

367b938 <Sutou Kouhei>  Fix artifacts path for Conda on Windows

Authored-by: Sutou Kouhei <kou@clear-code.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>

Author: kou

dev/tasks/conda-recipes/azure.win.yml

@@ -105,7 +105,7 @@ jobs:
           upload-artifacts ^
           --sha {{ task.branch }} ^
           --tag {{ task.tag }} ^
-          --pattern "arrow/dev/tasks/conda-recipes/build_artifacts/win-64/*.tar.bz2"
+          --pattern "D:\bld\win-64\*.tar.bz2"
       env:
         CROSSBOW_GITHUB_TOKEN: $(CROSSBOW_GITHUB_TOKEN)
       displayName: Upload packages as a GitHub release