chore: bump inter-package constraints to ^5.0@alpha

Completes 22ece5199 (open 5.0 dev line): root is 5.0.x-dev but the
self-referential api-platform/* constraints were left at ^4.4@alpha,
which is unresolvable in the component split-tests (published 4.4
alphas require metadata ^4.4, conflicting with the 5.0 root).

chore: require ^4.4@alpha for inter-package dependencies

#7115 added cross-package calls new in 4.4 — getStateOptionsRepositoryMethod()
in api-platform/state and the repositoryMethod constructor argument in
api-platform/doctrine-common — that 4.4 provider code invokes. The old
^4.2/^4.3 sibling floors let `composer update --prefer-lowest` pull releases
lacking these symbols, so the per-component lowest CI jobs failed with
"undefined method" / "unknown named parameter".

Floor all api-platform/* inter-package constraints at ^4.4. The @Alpha
stability flag is required because the subpackages set minimum-stability:beta,
under which a plain ^4.4 would not match the 4.4.0-alpha prereleases. Revert
to plain ^4.4 once 4.4.0 stable ships.

feat(openapi): support OpenAPI 3.2.0 (#8350)

fix(openapi): serialize Reference objects with $ref in the generated …

…document (#8306)

Fixes #8143

fix(openapi): serialize Reference objects with $ref in the generated …

…document (#8306)

Fixes #8143

Merge 4.2 into 4.3

Merge 4.2 into 4.3

fix(openapi): coerce metadata parameters in user-supplied openapi ope…

…ration (#8229)

Fixes #8182

fix(openapi): coerce metadata parameters in user-supplied openapi ope…

…ration (#8229)

Fixes #8182

fix(openapi): coerce metadata parameters in user-supplied openapi ope…

…ration (#8229)

Fixes #8182