[Security] Bump urllib3 from 1.26.2 to 1.26.3

Bumps [urllib3](https://github.com/urllib3/urllib3) from 1.26.2 to 1.26.3. **This update includes a security fix.**
- [Release notes](https://github.com/urllib3/urllib3/releases)
- [Changelog](https://github.com/urllib3/urllib3/blob/main/CHANGES.rst)
- [Commits](urllib3/urllib3@1.26.2...1.26.3)

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

Author: dependabot-preview[bot]