8.0.0 — PHP 8.3+ floor & lock-step major

[SmetDenis]

Coordinated ecosystem-wide 8.0 major (packaging-driven).

• Minimum PHP raised to 8.3 (CI: 8.3 / 8.4 / 8.5).
• All inter-package jbzoo/* deps → ^8.0.

Changed (BC — serialization wire-format)

• Migrated __sleep/__wakeup to __serialize/__unserialize (mandated by the codestyle @PhpCsFixer:risky modern_serialization_methods rule). Object reconstruction is identical, but the serialized byte string differs: a value serialize()d under v7 will NOT unserialize() back on v8 (and vice-versa). Affects anyone who persisted serialized simple-types objects across the upgrade (cache / DB / queue).

[coveralls]

Coverage is 99.599% — release/8.0 into master. No base build found for master.