Bump urllib3 from 1.26.14 to 1.26.15 in /tests (#3638)

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.14 to 1.26.15.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.14...1.26.15)

---
updated-dependencies:
- dependency-name: urllib3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

tests/requirements.txt

@@ -505,9 +505,9 @@ six==1.16.0 \
     #   kubernetes
     #   pytest-profiling
     #   python-dateutil
-urllib3==1.26.14 \
-    --hash=sha256:076907bf8fd355cde77728471316625a4d2f7e713c125f51953bb5b3eecf4f72 \
-    --hash=sha256:75edcdc2f7d85b137124a6c3c9fc3933cdeaa12ecb9a6a959f22797a0feca7e1
+urllib3==1.26.15 \
+    --hash=sha256:8a388717b9476f934a21484e8c8e61875ab60644d29b9b39e11e4b9dc1c6b305 \
+    --hash=sha256:aa751d169e23c7479ce47a0cb0da579e3ede798f994f5816a74e4f4500dcea42
     # via
     #   -r requirements.txt
     #   kubernetes