Bump werkzeug from 0.12.2 to 0.15.3 in /docker/meta-low-zoom-batch

Bumps [werkzeug](https://github.com/pallets/werkzeug) from 0.12.2 to 0.15.3.
- [Release notes](https://github.com/pallets/werkzeug/releases)
- [Changelog](https://github.com/pallets/werkzeug/blob/main/CHANGES.rst)
- [Commits](pallets/werkzeug@0.12.2...0.15.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

docker/meta-low-zoom-batch/requirements.txt

@@ -26,6 +26,6 @@ six==1.11.0
 statsd==3.2.1
 StreetNames==0.1.5
 ujson==1.35
-Werkzeug==0.12.2
+Werkzeug==0.15.3
 wsgiref==0.1.2
 zope.dottedname==4.2