Bump urllib3 in /examples/reservations-bot-demo/cloud_function

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.5 to 1.26.19.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/1.26.19/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.5...1.26.19)

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

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

Author: dependabot[bot]

examples/reservations-bot-demo/cloud_function/requirements.txt

@@ -11,7 +11,7 @@ pycparser==2.20
 pydantic==1.6.2
 PyJWT==2.4.0
 requests==2.31.0
-urllib3==1.26.5
+urllib3==1.26.19
 yandexcloud==0.48.0
 ydb==0.0.41