fix(deps): fix test/tools ginkgo typo

[Asutorufa]

What type of PR is this?

/kind bug

What this PR does / why we need it:

tests/tools/tools.go import wrong ginkgo package name

How to verify it

$ cd tests/tools
$ go mod tidy
go: finding module for package github.com/onsi/ginkgo/ginkgo/v2
go: github.com/containers/buildah/tests/tools imports
	github.com/onsi/ginkgo/ginkgo/v2: module github.com/onsi/ginkgo@latest found (v1.16.5), but does not contain package github.com/onsi/ginkgo/ginkgo/v2

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

None

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This pull-request has been approved by: Asutorufa
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