Update to stable php-tuf releases

Problem/Motivation

Follow-up from ✨ Add Alpha level Experimental Package Manager module Needs review

Probably a blocker for ✨ Add Alpha level Experimental Automatic Updates module Needs work .

We're on release candidates of php-tuf dependencies, we need to be on stable releases instead - should happen before the 11.1 release candidate.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

Introduced terminology

API changes

Data model changes

Release notes snippet