Update the go-kit/log package reference

[peimanja]

Fixes #108

Deprecation notice: The core Go kit log packages (log, log/level, log/term, and log/syslog) have been moved to their own repository at github.com/go-kit/log. The corresponding packages in this directory remain for backwards compatibility. Their types alias the types and their functions call the functions provided by the new repository. Using either import path should be equivalent. Prefer the new import path when practical.

[sonarcloud]

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