Updated mackerel-plugin-sidekiq, etc.

Hi, this is Igarashi (id:masarasi) from the Mackerel Team CRE.

Here are the details of the new update.

Updated mackerel-plugin-sidekiq

The latency metric is now available in mackerel-plugin-sidekiq.

This feature was pull requested by [@ch1aki] ( We would like to take this opportunity to express our gratitude to [@ch1aki] ( for their cooperation in this release. Thank you very much.

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