Bump step-runner to v0.20.0

Timo Furrerrequested to merge
bump-step-runner into main

What does this MR do?

Bump step-runner to v0.20.0

This change set bumps the step-runner to the latest v0.20.0 release. This requires a docker dependency bump that introduces new Go API deprecations which are also taken care of in this change set.

Why was this MR needed?

This step-runner release includes the change set required to use moa for job inputs interpolation.

What are the relevant issue numbers?

Refs #39072 (closed)

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