[Sync EN] ext/pdo, ext/pgsql: Add PHP 8.4.0 changelog entries for PGSQL and PDO pages (#5364)

Commit: `https://github.com/php/doc-en/commit/91183ddf1c54c6ce3051fdf0f5b9987272d51fbe`
PR: `https://github.com/php/doc-en/pull/5364`

**Zu aktualisierende DE-Dateien**
- `reference/pdo/pdo/getattribute.xml`
- `reference/pgsql/functions/pg-fetch-result.xml`
- `reference/pgsql/functions/pg-field-is-null.xml`
- `reference/pgsql/functions/pg-field-prtlen.xml`
