PHP Extension 5.5.6 released

• Bugfix: Prevent segfault on Alpine during RINIT with tracepoints enabled
• Bugfix: Only log time-limit event once, and not for each span after the time limit.
• Improvement: Reduce payload of backtraces to improve serialization performance
• Improvement: Add instrumentation for Elasticsearch PHP v8 library
• New Feature: Add Tideways\Profiler::markPageCacheHit/markPageCacheMiss for upcoming page cache hit-rate feature.