Bump werkzeug from 0.15.2 to 0.15.3 in /benchmarks/scripts

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 0.15.2 to 0.15.3.
- [Release notes](https://github.com/pallets/werkzeug/releases)
- [Changelog](https://github.com/pallets/werkzeug/blob/master/CHANGES.rst)
- [Commits](pallets/werkzeug@0.15.2...0.15.3)

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

benchmarks/scripts/requirements.txt

@@ -71,4 +71,4 @@ urllib3==1.24.2
 virtualenv==16.4.3
 virtualenv-clone==0.5.2
 virtualenvwrapper==4.8.4
-Werkzeug==0.15.2
+Werkzeug==0.15.3