Update bleach for vulnerabilities

[geekygirlsarah]

What GitHub issue does this PR apply to?

Resolves Dependabot dependency

What changed and why?

Update bleach from 6.3.0 to 6.4.0

AI bots used in the process of making this PR

N/A

(If editing website code) Please add screenshots

Checklist

• I claimed any associated issue(s) and they are not someone else's
• I have looked at documentation to ensure I made any revisions correctly
• I tested my changes locally to ensure they work
• For language files, I have validated the edited files are valid JSON and data shows up correctly
• For website code edits, I have added or edited any appropriate unit tests for my changes
• If I used artificial intelligence (AI), I have reviewed the suggested changes and ensured they work correctly

Any additional comments or things to be aware of while reviewing?