Bump k8s.io/apiserver from 0.19.4 to 0.20.0 in /test/apiserver

[dependabot[bot]]

Bumps k8s.io/apiserver from 0.19.4 to 0.20.0.

Commits

• 40006ae Update dependencies to v0.20.0 tag
• d16c5b2 Merge pull request #96662 from wojtek-t/fix_starting_rv_test
• 14a89ca Merge pull request #96727 from liggitt/revert-timeout
• cec339c Revert "plumb context with request deadline"
• 9d2ba50 Revert "use default value when the specified timeout is 0s"
• ca59433 Merge pull request #96185 from roycaihw/dedup-owner-references
• 16ef353 Merge pull request #96681 from tkashem/request-timout-e2e
• 2b4b1e4 generated
• 77d7726 unit and integration tests
• 00bc4d7 apiserver dedups owner references and adds warning
• Additional commits viewable in compare view

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[kd7lxl]

Combined the Dependabot PRs so k8s.io is all on 0.20.0.

[kd7lxl]

Looks like apiserver-builder-alpha will need to be upgraded to support 0.20 before this will pass.

[dependabot[bot]]

A newer version of k8s.io/apiserver exists, but since this PR has been edited by someone other than Dependabot I haven't updated it. You'll get a PR for the updated version as normal once this PR is merged.