Update offline-plugin to the latest

[NekR]

No description provided.

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[NekR]

CLA Signed

[googlebot]

CLAs look good, thanks!

[filipesilva]

We're actually not using it for a while now, and it was fully removed with #4143.

[NekR]

Sure. If you'll start using it again and 'll need some help then let me know :-)

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