Fix file path separator for Windows

Signed-off-by: Jacob Perron <[email protected]>

Author: jacobperron

.github/workflows/build_and_test.yml

@@ -36,4 +36,4 @@ jobs:
         package-name: rosidl_generator_java rcljava_common rcljava
         vcs-repo-file-url: |
             https://raw.githubusercontent.com/ros2/ros2/dashing/ros2.repos
-            "${{ github.workspace }}/ros2_java_desktop.repos"
+            "${{ github.workspace }}\ros2_java_desktop.repos"