chore(deps): bump dompurify from 3.4.8 to 3.4.9 in /src/frontend

[dependabot]

Bumps dompurify from 3.4.8 to 3.4.9.

Release notes

Sourced from dompurify's releases.

DOMPurify 3.4.9

• Further improved the handling of Trusted Types config options, thanks @​offset
• Further improved the handling of IN_PLACE sanitization, thanks @​mozfreddyb
• Added more test coverage for IN_PLACE and Trusted Types related usage
• Bumped several dependencies where possible
• Updated README and wiki with more accurate documentation & attack samples

Commits

• 5210247 release: 3.4.9 (#1459)
• See full diff in compare view

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[vybe]

Closing as superseded by #1241, which bumps dompurify to 3.4.10 (≥ this PR's 3.4.9) as part of the patch-and-minor group and is being merged to dev. Merging this 3.4.9 bump afterward would be a no-op/downgrade. Thanks Dependabot — the newer bump covers it.

[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.