Update action.yml

Author: mcbarton

.github/actions/Build_and_Test_cppyy/action.yml

@@ -143,7 +143,7 @@ runs:
         # Download cppyy-backend
         git clone --depth=1 https://github.com/compiler-research/cppyy-backend.git
         cd cppyy-backend
-        mkdir -p $env:CPPINTEROP_DIR\lib
+        mkdir $env:CPPINTEROP_DIR\lib
         mkdir build
         cd build
         # Install CppInterOp