Bump gocloud.dev, knative.dev/pkg, k8s.io dependencies.

[wlynch]

Changes

Chained dependency bump due to incompatible dependabot update (see #585)

Bumps:

• gocloud.dev v0.26.0 -> v0.27.0
• k8s.io/api v0.23.9 -> v0.25.2
• knative.dev/pkg to latest

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Release Notes

NONE

[priyawadhwa]

/lgtm

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[chuangw6]

/retest

[priyawadhwa]

/lgtm