Update redis requirement from <=4.6.0 to <=5.0.3

[dependabot[bot]]

Updates the requirements on redis to permit the latest version.

Release notes

Sourced from redis's releases.

5.0.3

Changes

🐛 Bug Fixes

• Fix breaking change: message in LockError is now optional (#3176)

🧰 Maintenance

• Bump release-drafter/release-drafter from 5 to 6 (#3171)
• Bump rojopolis/spellcheck-github-actions from 0.35.0 to 0.36.0 (#3172)
• Remove redundant async-timeout dependency (#3177)

Commits

• 1784b37 Version 5.0.3 (#3179)
• e90b7c5 Cherry pick for v5.0.3 (#3178)
• 535f90e Version 5.0.2 (#3164)
• 911aa37 Cherry pick for v5.0.2 (#3159)
• cc4bc1a Version 5.0.1 (#2958)
• 2ee7c3c Type hint improvements (#2952)
• 56b254e Save a reference to created async tasks, to avoid tasks potentially disappear...
• 1b370da Replace clear_connect_callbacks with _deregister_connect_callback (#2955)
• ded9f7c async fixes, remove del and other things (#2870)
• c46a28d Provide aclose() / close() for classes requiring lifetime management (#2898)
• Additional commits viewable in compare view

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[dependabot[bot]]

Superseded by #169.