Bump werkzeug from 2.2.3 to 2.3.8 in /boilerplates/dash

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 2.2.3 to 2.3.8.
- [Release notes](https://github.com/pallets/werkzeug/releases)
- [Changelog](https://github.com/pallets/werkzeug/blob/main/CHANGES.rst)
- [Commits](pallets/werkzeug@2.2.3...2.3.8)

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

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

boilerplates/dash/requirements.txt

@@ -24,7 +24,7 @@ retrying==1.3.3
 six==1.11.0
 traitlets==4.3.2
 urllib3==1.26.5
-Werkzeug==2.2.3
+Werkzeug==2.3.8
 numpy==1.22.0
 pandas==0.25.3
 dash-table-experiments==0.6.0