RELEASE.md: remove superfluous step about go.mods

Author: sttts

RELEASE.md

@@ -5,7 +5,6 @@ following controller-runtime releases. The process is as follows:
 
 1. An issue is proposing a new release with a changelog since the last release.
 1. All [OWNERS](OWNERS) must LGTM this release. 
-1. Ensure that all go.mods point to the relevant Kubernetes and controller-runtime versions.
 1. An OWNER runs `hack/release.sh v$MAJOR.$MINOR.$PATCH`.
 1. Create a release branch with `git checkout -b release-$MAJOR.$MINOR` from `$VERSION`
    and push it to Github `git push origin release-$MAJOR.$MINOR`.