[Sync EN] ext/pdo: PHP 8.4 changes across PDO, PDO_PGSQL and PDO_Firebird

PR: `https://github.com/php/doc-en/pull/5703` (2026-08-03)

**Файлы RU для обновления**
- `reference/pdo/pdo/getattribute.xml`
- `reference/pdo/pdo/prepare.xml`
- `reference/pdo/pdostatement/getattribute.xml`
- `reference/pdo_firebird/configure.xml`
- `reference/pdo_pgsql/configure.xml`
- `reference/pdo_pgsql/pdo-pgsql.xml`
- `reference/pdo_pgsql/reference.xml`

