Update action.yml

Author: mcbarton

.github/actions/Build_and_Test_cppyy/action.yml

@@ -153,7 +153,7 @@ runs:
         # Build and Install cppyy-backend
         cmake -DCppInterOp_DIR=$env:CPPINTEROP_DIR ..
         cmake --build . --parallel ${{ env.ncpus }}
-        cp libcppyy-backend.dll $CPPINTEROP_DIR\lib\
+        cp libcppyy-backend.lib $env:CPPINTEROP_DIR\lib\
         cd ..
 
     - name: Install CPyCppyy