check fix for when file is not present

Author: hjgraca

.github/workflows/update_version.yml

@@ -42,12 +42,12 @@ jobs:
       - name: Check if changes exist
         id: check_changes
         run: |
-          if git diff --quiet version.txt; then
+          git add version.txt
+          if git diff --staged --quiet; then
             echo "has_changes=false" >> $GITHUB_OUTPUT
           else
             echo "has_changes=true" >> $GITHUB_OUTPUT
           fi
-
       - name: Create PR for version.txt update
         if: steps.check_changes.outputs.has_changes == 'true'
         uses: peter-evans/create-pull-request@271a8d0340265f705b14b6d32b9829c1cb33d45e # v7.0.8