fix: upgrade pdfjs-dist from 2.13.216 to 2.15.349 (#71)

Snyk has created this PR to upgrade pdfjs-dist from 2.13.216 to 2.15.349.

See this package in npm:
https://www.npmjs.com/package/pdfjs-dist

See this project in Snyk:
https://app.snyk.io/org/ajurna/project/127292ba-f6a3-4db6-aa37-06b046e6c7a2?utm_source=github&utm_medium=referral&page=upgrade-pr

Co-authored-by: snyk-bot <snyk-bot@snyk.io>

package.json

@@ -7,7 +7,7 @@
         "isotope-layout": "^3.0.6",
         "jquery": "^3.6.0",
         "js-cookie": "^2.2.1",
-        "pdfjs-dist": "^2.7.570",
+        "pdfjs-dist": "^2.15.349",
         "reveal.js": "^4.1.0",
         "reveal.js-menu": "^2.1.0"
     }