Update wp-cli framework

[wp-make-coffee]

This is an automated pull-request

Updates the wp-cli/wp-cli framework to the latest changeset.

[swissspidy]

@danielbachhuber shod we just auto merge these when all tests pass?

[danielbachhuber]

@swissspidy I'm indifferent. I don't mind merging them, and I like the idea that there's a final confidence check before something goes into the nightly, but I'd be open to auto-merging too.