Update urllib3 to 2.6.3

[pyup-bot]

This PR updates urllib3 from 2.6.2 to 2.6.3.

Changelog

2.6.3

==================

- Fixed a high-severity security issue where decompression-bomb safeguards of
the streaming API were bypassed when HTTP redirects were followed.
(`GHSA-38jv-5279-wg99 <https://github.com/urllib3/urllib3/security/advisories/GHSA-38jv-5279-wg99>`__)
- Started treating ``Retry-After`` times greater than 6 hours as 6 hours by
default. (`3743 <https://github.com/urllib3/urllib3/issues/3743>`__)
- Fixed ``urllib3.connection.VerifiedHTTPSConnection`` on Emscripten.
(`3752 <https://github.com/urllib3/urllib3/issues/3752>`__)

Links

• PyPI: https://pypi.org/project/urllib3
• Changelog: https://data.safetycli.com/changelogs/urllib3/