Bumps up the 'file-changes-action' version to fix 500 error.

* Example error: https://github.com/tensorflow/tfx/actions/runs/3358645261/jobs/5617984100
* Related thread: trilom/file-changes-action#104

PiperOrigin-RevId: 485787177

.github/workflows/ci-test.yml

@@ -18,7 +18,7 @@ jobs:
     - uses: actions/checkout@v2
     - name: Get Changed Files
       id: changed_files
-      uses: trilom/[email protected].3
+      uses: trilom/[email protected].4
       with:
         fileOutput: ' '
     - name: Select files to check