Bump urllib3 from 2.0.2 to 2.0.3 in /tools

Bumps [urllib3](https://github.com/urllib3/urllib3) from 2.0.2 to 2.0.3.
- [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/2.0.2...2.0.3)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/tools/wptrunner/requirements.txt b/tools/wptrunner/requirements.txt
index 61c3c08..32fd3ff 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==2.0.2
+urllib3==2.0.3