build(deps): bump bleach from 3.1.0 to 3.1.1

Bumps [bleach](https://github.com/mozilla/bleach) from 3.1.0 to 3.1.1.
- [Release notes](https://github.com/mozilla/bleach/releases)
- [Changelog](https://github.com/mozilla/bleach/blob/master/CHANGES)
- [Commits](mozilla/bleach@v3.1.0...v3.1.1)

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

requirements.txt

@@ -43,7 +43,7 @@ backports.functools-lru-cache==1.5
 backports.shutil-get-terminal-size==1.0.0
 billiard==3.5.0.5
 binaryornot==0.4.4
-bleach==3.1.0
+bleach==3.1.1
 blinker==1.4
 cairocffi==0.9.0
 CairoSVG==1.0.22