Update celery requirement from ==5.3.* to ==5.4.* (#4091)

Updates the requirements on [celery](https://github.com/celery/celery) to permit the latest version.
- [Release notes](https://github.com/celery/celery/releases)
- [Changelog](https://github.com/celery/celery/blob/main/Changelog.rst)
- [Commits](https://github.com/celery/celery/compare/v5.3.0a1...v5.4.0)

---
updated-dependencies:
- dependency-name: celery
  dependency-type: direct:production
...

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pyproject.toml

@@ -30,7 +30,7 @@ dependencies = [
   "babel",
   "BeautifulSoup4==4.12.*",
   "bleach==5.0.*",
-  "celery==5.3.*",
+  "celery==5.4.*",
   "chardet==5.2.*",
   "cryptography>=3.4.2",
   "css-inline==0.14.*",