[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] <[email protected]>

Author: dependabot-preview[bot]