Update dependency pdfjs-dist to v2.8.335

This MR contains the following updates:

Package	Type	Update	Change
pdfjs-dist (source)	dependencies	minor	2.7.570 -> 2.8.335

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Release Notes

mozilla/pdfjs-dist

v2.8.335

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src/dbp-pdf-preview.js

@@ -7,7 +7,7 @@ import DBPLitElement from '@dbp-toolkit/common/dbp-lit-element';
 import {MiniSpinner, Icon} from '@dbp-toolkit/common';
 import * as commonUtils from "@dbp-toolkit/common/utils";
 import * as commonStyles from '@dbp-toolkit/common/styles';
-import pdfjs from 'pdfjs-dist/es5/build/pdf.js';
+import pdfjs from 'pdfjs-dist/legacy/build/pdf.js';
 import {name as pkgName} from './../package.json';
 import {readBinaryFileContent} from './utils.js';