Bump pdfjs-dist from 2.4.456 to 2.5.207 (#6170)

Bumps [pdfjs-dist](https://github.com/mozilla/pdfjs-dist) from 2.4.456 to 2.5.207.
- [Release notes](https://github.com/mozilla/pdfjs-dist/releases)
- [Commits](https://github.com/mozilla/pdfjs-dist/compare/v2.4.456...v2.5.207)

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package.json

@@ -97,7 +97,7 @@
     "moment-es6": "^1.0.0",
     "ng2-charts": "2.3.3",
     "ngx-monaco-editor": "8.1.1",
-    "pdfjs-dist": "2.4.456",
+    "pdfjs-dist": "2.5.207",
     "raphael": "2.3.0",
     "rxjs": "^6.6.2",
     "snyk": "^1.404.0",