Update bleach requirement from ==6.3.* to ==6.4.* (#6249)

Updates the requirements on [bleach](https://github.com/mozilla/bleach) to permit the latest version.
- [Changelog](https://github.com/mozilla/bleach/blob/main/CHANGES)
- [Commits](https://github.com/mozilla/bleach/compare/v6.3.0...v6.4.0)

---
updated-dependencies:
- dependency-name: bleach
  dependency-version: 6.4.0
  dependency-type: direct:production
...

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pyproject.toml

@@ -30,7 +30,7 @@ dependencies = [
   "arabic-reshaper==3.0.1",  # Support for Arabic in reportlab
   "babel",
   "BeautifulSoup4==4.14.*",
-  "bleach==6.3.*",
+  "bleach==6.4.*",
   "celery==5.6.*",
   "chardet==5.2.*",
   "cryptography>=48.0.0",