Revert ":broom: Hide problematic deps within submodules"

[cardil]

Reverts #7

See the reason, here: #7 (comment)

And also the discussion here: https://cloud-native.slack.com/archives/C04LY4M2G49/p1680861772230839

[pierDipi]

/lgtm

[knative-prow]

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[cardil]

Unfortunately, this rollback hasn't resolved the problem. The knative.dev/toolbox/kntest is already cached in GOPROXY. That's why it keeps finding it instead of the roll backed version:

go: downloading knative.dev/toolbox v0.0.0-20230407111620-2aaf6de75f2e
go: downloading knative.dev/toolbox/kntest v0.0.0-20230406165419-0318b24a34cf
go: knative.dev/toolbox/kntest/cmd/kntest@latest (in knative.dev/toolbox/kntest@v0.0.0-20230406165419-0318b24a34cf):
	The go.mod file for the module providing named packages contains one or
	more replace directives. It must not contain directives that would cause
	it to be interpreted differently than if it were the main module.