composer.json: admit Drupal 12 in drupal/core constraint

Andrii Podanenkorequested to merge
d12-composer-core-constraint into main

composer.json still requires drupal/core: ^10 || ^11, so Composer refuses 1.2.0 on Drupal 12 although openy_socrates.info.yml declares ^12. Adds || ^12; no code change.

Not tested: no PHP/Composer here; JSON validity only. Suggested next tag: 1.2.1.

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