Update action.yml

Author: mcbarton

.github/actions/Build_and_Test_CppInterOp/action.yml

@@ -113,7 +113,7 @@ runs:
         # Build CppInterOp next to cling and llvm-project.
         mkdir build
         cd build
-        $env:CPPINTEROP_BUILD_DIR="$env:PWD_DIR"
+        $env:CPPINTEROP_BUILD_DIR=$PWD.Path
         echo "CPPINTEROP_BUILD_DIR=$env:CPPINTEROP_BUILD_DIR"
         echo "CPPINTEROP_BUILD_DIR=$env:CPPINTEROP_BUILD_DIR" >> $env:GITHUB_ENV
         if ( "${{ matrix.cling }}" -imatch "On" )