deps: bump dompurify from 3.4.11 to 3.4.12

[dependabot]

Bumps dompurify from 3.4.11 to 3.4.12.

Release notes

Sourced from dompurify's releases.

DOMPurify 3.4.12

• Fixed an issue where a hook would not get called for custom elements, thanks @​Rikuxx0
• Hardened the handling of hooks removing elements, @​mkrause-bee360
• Added support for a few new SVG attributes, thanks @​cbn-falias & @​Develop-KIM
• Hardened the handling of declarative partial updates
• Updated the documentation is several spots, README, wiki, etc.
• Bumped several dependencies where possible

Commits

• a9ca1e5 release: 3.4.12 (#1537)
• See full diff in compare view

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[catomean]

Landed via the batch bump (#422) — version is now current on main.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.