Bump urllib3 from 1.26.17 to 1.26.18 in /src/api-engine

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.17 to 1.26.18.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.17...1.26.18)

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

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

src/api-engine/requirements.txt

@@ -52,7 +52,7 @@ sqlparse==0.4.4
 strict-rfc3339==0.7
 swagger-spec-validator==2.5.0
 uritemplate==3.0.1
-urllib3==1.26.17
+urllib3==1.26.18
 uWSGI==2.0.22
 validate-email==1.3
 watchdog==0.10.2