Bump werkzeug from 0.15.2 to 0.15.5

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 0.15.2 to 0.15.5.
- [Release notes](https://github.com/pallets/werkzeug/releases)
- [Changelog](https://github.com/pallets/werkzeug/blob/main/CHANGES.rst)
- [Commits](pallets/werkzeug@0.15.2...0.15.5)

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

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

requirements.txt

@@ -15,7 +15,7 @@ greenlet==0.4.15
 # flask deps
 Jinja2==2.11.3
 MarkupSafe==1.1.1
-Werkzeug==0.15.2
+Werkzeug==0.15.5
 click==7.0
 itsdangerous==1.1.0