Verify composer.json constraint changes

[boesing]

Feature Request

Q	A
New Feature	yes
RFC	yes
BC Break	no

Summary

We do have a few components where we actually implement specific interfaces, such as PSR ones.
We had a release for laminas-servicemanager which stated to support psr/container v2 support. That was incorrect, due to several things:

1. the composer.json did not provide support for ^2.0 of the psr/container package via psr/container-implementation.
2. the composer.lock did not contain the latest version of psr/container since it got blocked by a 3rd-party library which did not supported psr/container v2 yet (but was only added as a dev-dependency)

At least due to the 2nd issue, all tests were passing and thus the PR got merged.

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So what we could try to do is:

1. use diff to find those packages which were changed
2. use jq to extract provide packages
3. compare provide constraint with require constraint

Or maybe something else. I'll keep this here to keep track of my ideas.