Bump bleach from 3.3.0 to 6.4.0

Bumps [bleach](https://github.com/mozilla/bleach) from 3.3.0 to 6.4.0.
- [Changelog](https://github.com/mozilla/bleach/blob/main/CHANGES)
- [Commits](mozilla/bleach@v3.3.0...v6.4.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

requirements.txt

@@ -1,7 +1,7 @@
 appnope==0.1.0
 attrs==19.3.0
 backcall==0.1.0
-bleach==3.3.0
+bleach==6.4.0
 blis==0.4.1
 catalogue==1.0.0
 category-encoders==2.1.0