Bump urllib3 from 1.26.4 to 1.26.5 in /examples/tests

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.4 to 1.26.5.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.4...1.26.5)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: indirect
...

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

examples/tests/requirements.txt

@@ -53,7 +53,7 @@ toml==0.10.2
 tqdm==4.56.0
 typing-extensions==3.7.4.3
 typing-inspect==0.6.0
-urllib3==1.26.4
+urllib3==1.26.5
 wasabi==0.8.2
 xgboost==1.2.0