[Snyk] Security upgrade pdfjs-dist from 2.6.347 to 4.2.67

[ansu5555]

This PR was automatically created by Snyk using the credentials of a real user.

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • package.json
  • package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Priority Score (*)	Issue	Breaking Change	Exploit Maturity
	726/1000 Why? Recently disclosed, Has a fix available, CVSS 8.8	Arbitrary Code Injection SNYK-JS-PDFJSDIST-6810403	Yes	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Check the changes in this PR to ensure they won't cause issues with your project.

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (3907cc4) to head (8d30759).

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #118   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           12        12           
  Lines           75        75           
  Branches        25        25           
=========================================
  Hits            75        75           

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