Update redis requirement from =0.21.6 to =0.22.1 in /using_redis-rs

[dependabot[bot]]

Updates the requirements on redis to permit the latest version.

Release notes

Sourced from redis's releases.

v0.22.1

0.22.1 (2022-10-18)

Changes

• Add README attribute to Cargo.toml
• Update LICENSE file / symlink from parent directory

Commits

• 535d9f4 Increment versions / update CHANGELOGs
• 172531b Update licenses and READMEs
• 175395e Release redis-0.22.0 / redis-test-0.1.0
• 0da6040 Update version numbers in code samples.
• 0c6b9ec Merge branch '0.21.x'
• c14b73f Add Rule::Other to cover newly defined flags. #682 (#685)
• dbe4290 Fix changelog for 0.21.6
• 79fde68 Support ipv6 connect
• 0302280 Derive Clone and add Deref trait to InfoDict (#661)
• 2559af6 Update changelog for 0.21.6
• Additional commits viewable in compare view

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