Bumps [dompurify](https://github.com/cure53/DOMPurify) from 3.3.3 to 3.4.0.

Release notes

DOMPurify 3.4.0

Most relevant changes:

Fixed a problem with FORBID_TAGS not winning over ADD_TAGS, thanks @kodareef5

Fixed several minor problems and typos regarding MathML attributes, thanks @DavidOliver

Fixed ADD_ATTR/ADD_TAGS function leaking into subsequent array-based calls, thanks @1Jesper1

Fixed a missing SAFE_FOR_TEMPLATES scrub in RETURN_DOM path, thanks @bencalif

Fixed a prototype pollution via CUSTOM_ELEMENT_HANDLING, thanks @trace37labs

Fixed an issue with ADD_TAGS function form bypassing FORBID_TAGS, thanks @eddieran

Fixed an issue with ADD_ATTR predicates skipping URI validation, thanks @christos-eth

Fixed an issue with USE_PROFILES prototype pollution, thanks @christos-eth

Fixed an issue leading to possible mXSS via Re-Contextualization, thanks @researchatfluidattacks and others

Fixed an issue with closing tags leading to possible mXSS, thanks @frevadiscor

Fixed a problem with the type dentition patcher after Node version bump

Fixed freezing BS runs by reducing the tested browsers array

Bumped several dependencies where possible

Added needed files for OpenSSF scorecard checks

Published Advisories are here: https://github.com/cure53/DOMPurify/security/advisories?state=published

Commits

5b16e0b Getting 3.x branch ready for 3.4.0 release (#1250)
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--- ## Summary by cubic Upgrade `dompurify` in `/gui` from 3.3.3 to 3.4.0 to bring in security fixes and stricter HTML sanitization. No app code changes; improves protection against XSS and prototype pollution. - **Dependencies** - Bumped `dompurify` to 3.4.0, which fixes issues with `FORBID_TAGS` precedence, URI validation in `ADD_ATTR`, missing template scrubs in `RETURN_DOM`, and multiple prototype‑pollution and mXSS vectors. - No migration steps; note that sanitization may be stricter and strip more tags/attrs in edge cases. ^{Written for commit 929c08baae1d4783315ae07ca1ff2527cb14cee0. Summary will update on new commits.}