Bump ezyang/htmlpurifier from 4.19.0 to 4.19.1

Bumps ezyang/htmlpurifier from 4.19.0 to 4.19.1.

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updated-dependencies:

• dependency-name: ezyang/htmlpurifier
  dependency-version: 4.19.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  ...

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Fixes 0037423, PR https://github.com/mantisbt/mantisbt/pull/2286