Fix in windows unit test (#1099)

Author: mischab

.circleci/unittest/windows_optdepts/scripts/environment.yml

@@ -16,3 +16,4 @@ dependencies:
     - pyyaml
     - scipy
     - coverage
+    - msvc-runtime

.circleci/unittest/windows_optdepts/scripts/setup_env.sh

@@ -26,6 +26,8 @@ if [ ! -d "${conda_dir}" ]; then
 fi
 
 eval "$(${conda_dir}/Scripts/conda.exe 'shell.bash' 'hook')"
+conda config --set channel_priority strict
+conda update -n base -c defaults conda
 
 # 2. Create test environment at ./env
 if [ ! -d "${env_dir}" ]; then