Bump werkzeug from 0.15.2 to 0.15.3 in /CTAI_model

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](https://github.com/pallets/werkzeug/compare/0.15.2...0.15.3)

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

CTAI_model/requirements.txt

@@ -1,5 +1,5 @@
 Flask==1.1.1
-Werkzeug==0.15.2
+Werkzeug==0.15.3
 pandas==0.23.4
 numpy==1.15.0
 Pillow==6.1.0