Bump urllib3 from 1.26.18 to 1.26.19 in /app (#31)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.18 to 1.26.19.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.18...1.26.19)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

app/requirements.txt

@@ -34,7 +34,7 @@ pytz==2018.5
 requests==2.31.0
 six==1.12.0
 slackclient==1.3.1
-urllib3==1.26.18
+urllib3==1.26.19
 websocket-client==0.54.0
 Werkzeug==3.0.3
 wrapt==1.11.0