Changes
- Revert use of monotonic clock for TTL (#451)
- Fix a crash when serializing packed arrays (e.g. lists) in PHP 8.2+ with `apc.serializer=default`.
- Reduce memory usage when serializing packed arrays (e.g. lists) in PHP 8.2+ with `apc.serializer=default`.
- Speed up serializing arrays with `apc.serializer=default`.
- Reduce memory usage when unserializing instances of the empty array in PHP 7.3+.
- Removed no longer working apcue extension.
- Increased limit on maximum number of slots.
- Made tests compatible with PHP 8.3.