Prefix PSR libraries for Mpdf only

[jakejackson1]

Description

This resolves a conflict with 3rd party plugins who include PSR Log v3.

Testing instructions

Screenshots

Checklist:

• [ ] I've tested the code.
• [ ] My code is easy to read, follow, and understand
• [ ] My code follows the accessibility standards.
• [ ] My code has proper inline documentation / docblocks.

Additional Comments

[codecov[bot]]

Codecov Report

Merging #1473 (c2e59c8) into development (af1798e) will not change coverage. The diff coverage is n/a.

:exclamation: Current head c2e59c8 differs from pull request most recent head 99bc914. Consider uploading reports for the commit 99bc914 to get more accurate results

@@             Coverage Diff              @@
##           development    #1473   +/-   ##
============================================
  Coverage        93.30%   93.30%           
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  Files               57       57           
  Lines             1464     1464           
  Branches           370      370           
============================================
  Hits              1366     1366           
  Misses              90       90           
  Partials             8        8