Bump urllib3 from 2.0.5 to 2.0.6 in /tools/wptrunner

Bumps [urllib3](https://github.com/urllib3/urllib3) from 2.0.5 to 2.0.6.
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](https://github.com/urllib3/urllib3/compare/v2.0.5...2.0.6)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/tools/wptrunner/requirements.txt b/tools/wptrunner/requirements.txt
index ffb46de..1c4316a 100644
--- a/tools/wptrunner/requirements.txt
+++ b/tools/wptrunner/requirements.txt
@@ -7,4 +7,4 @@
 pillow==9.5.0
 requests==2.31.0
 six==1.16.0
-urllib3==2.0.5
+urllib3==2.0.6