fix: update k8s to go 1.20

[Tallicia]

updated and has updated with go mod tidy.

[#185619304]

@peterhaochen47

[cf-gitbot]

We have created an issue in Pivotal Tracker to manage this:

https://www.pivotaltracker.com/story/show/185741385

The labels on this github issue will be updated when the story is started.

[hsinn0]

The change itself, which has the one-line change in go.mod is as expected. However, there is something wrong with the commit message.

has updated with go mod vendor

go mod vendor would have created vendor folder as it did not exist yet. However, vendor folder is not a part of the commit and it should not be as we do not need/want that for this go module. Just doing go mod tidy was enough for this change. I suggest to remove "go mod vendor" from the commit message.
See https://go.dev/ref/mod#vendoring.

[hsinn0]

See the comment regarding the commit message.

[Tallicia]

@hsinn0 The requested changes have been made.

[hsinn0]

I see the PR comment updated. However, the commit message was not. Isn't the commit message the one added as commit message after "Rebase and merge"?