change to Pdf.js-Legacy Version 4.3.136 (#1444)

* add: PDF.js-Legacy

* change path

src/main/resources/templates/convert/pdf-to-pdfa.html

@@ -32,7 +32,7 @@
               </form>
               <script th:inline="javascript">
                 document.getElementById('fileInput-input').addEventListener('change', async () => {
-                  pdfjsLib.GlobalWorkerOptions.workerSrc = './pdfjs/pdf.worker.mjs';
+                  pdfjsLib.GlobalWorkerOptions.workerSrc = './pdfjs-legacy/pdf.worker.mjs';
                   const fileInput = document.getElementById('fileInput-input');
                   const resultDiv = document.getElementById('result');