Fixes #4250 to backport Composer 2.x functionality into 11.x. #4260
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Motivation
Fixes #4250
What problem does this solve? Why is it important? What's the context? If this fixes an issue, link to it above.
Adds composer 2.x support for BLT 11.x.
Proposed changes
What does this PR change? How does this impact end users? Are manual or automatic updates required?
see #4144