Update minimum version of dompdf for security reasons

Problem/Motivation

The module has a potential Remote code injection vulnerability due to depending on 0.8.4 of the dompdf/dompdf package: https://git.drupalcode.org/project/entity_print/-/blob/85f8e5fe/composer...

References:

- https://github.com/advisories/GHSA-x752-qjv4-c4hc
- https://github.com/Roave/SecurityAdvisories/commit/8de287d3e2b7504c77a6f...

Originally reported by codebymikey to the security queue, but can be public under https://www.drupal.org/psa-2011-002

Steps to reproduce

Proposed resolution

Update the minimum constraint

Remaining tasks

User interface changes

API changes

Data model changes