Update maturity plans for Package stage
Why is this change being made?
We recently hit our maturity targets for the Package Registry and Helm Charts. However, we missed our deadline for the dependency proxy.
Updating accordingly. Separately, we will be working to refine our maturity targets in the coming months via JTBD https://gitlab.com/gitlab-org/ci-cd/package-stage/team/issues/25
Does this MR meet the acceptance criteria?
Conformity
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Added description to this MR explaining the reasons for the proposed change, per say-why-not-just-what