Merge pull request #60446 from cblecker/no-dep-reviewer

Automatic merge from submit-queue (batch tested with PRs 59365, 60446, 60448, 55019, 60431). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Remove dep-reviewers

**What this PR does / why we need it**:
The dep-reviewers group seems to get assigned PRs early the the review process. However, most code changes should be reviewed in the importing part of the code base first, and then assigned to an approver after.

By removing the reviewers group, the approvers plugin will still suggest assigning to an approver, but won't assign for review when the PR is initially opened.

**Release note**:

```release-note
NONE
```

Kubernetes-commit: 724a2f968c6981efc9f5a85e4ad60f56e1c0902f