Fix file assignment to handle changed files correctly

Author: goruha

action.yml

@@ -256,7 +256,7 @@ runs:
           fi
         done
         echo "5"
-        files="$(echo ${changed_files} | tr '\n' ',')"
+        files="$(echo ${changed_files})"
         echo "6"
         echo "${files}"
         echo "file=${files}" >> $GITHUB_OUTPUT