Fix command in dep bump document

[ElijahQuinones]

What type of PR is this?

/cleanup

What is this PR about? / Why do we need it?

Fix command listed in docs/updating-dependencies.md

How was this change tested?

gh repo checkout pr 2320
unknown command "checkout" for "gh repo"

Usage:  gh repo <command> [flags]

Available commands:
  archive
  autolink
  clone
  create
  delete
  deploy-key
  edit
  fork
  gitignore
  license
  list
  rename
  set-default
  sync
  unarchive
  view

❯ gh pr checkout 2320
branch 'dependabot/go_modules/misc-dependencies-9f91678858' set up to track 'origin/dependabot/go_modules/misc-dependencies-9f91678858'.
Switched to a new branch 'dependabot/go_modules/misc-dependencies-9f91678858'

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

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[github-actions]

Code Coverage Diff

This PR does not change the code coverage