Bump redis from 0.25.3 to 0.25.4

Bumps redis from 0.25.3 to 0.25.4.

Commits

• 337dd81 Prepare release 0.25.4
• 5c6db27 Fix clippy warnings (#1180)
• c6da2ee Fix explicit IoError not being recognized
• See full diff in compare view

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