ci: Fix actionlint error

Author: SnO2WMaN

.github/workflows/update-deps.yml

@@ -24,9 +24,9 @@ jobs:
         id: check_changes
         run: |
           if git diff --quiet; then
-            echo "has_changes=false" >> $GITHUB_OUTPUT
+            echo "has_changes=false" >> "$GITHUB_OUTPUT"
           else
-            echo "has_changes=true" >> $GITHUB_OUTPUT
+            echo "has_changes=true" >> "$GITHUB_OUTPUT"
           fi
 
       - name: Commit and create PR