fix(deps): update dependency io.opentelemetry:opentelemetry-bom to v1.68.0 - #2662

v1.68.0

API

• Add null guards and API usage logging for tracing, metrics, propagation, and context APIs
  (#​8913, #​8968)
• Add stable io.opentelemetry.api.impl.Base16EncodingUtils and TemporaryBuffers utilities
  (#​8929, #​8955)
• Fix uncompilable Javadoc examples in context APIs
  (#​8934)

Incubating

• Avoid false type warnings in DeclarativeConfigProperties.toMap()
  (#​8921)

Extensions

• Trace propagators: Handle malformed URL escapes in Jaeger headers
  (#​8912)
• Trace propagators: Include the B3 debug header in multi-header propagation fields
  (#​8930)
• Trace propagators: Fix hexadecimal flag parsing in Jaeger headers
  (#​8975)

SDK

• Remove cross-module internal utility dependencies from resource and retry code
  (#​8916)
• Add experimental SdkResourceProvider support shared by tracer, meter, and logger providers
  (#​8865)

Traces

• Retain invalid span links with attributes or trace state
  (#​8917)

Metrics

• Use a dedicated export worker in PeriodicMetricReader, queue concurrent flushes, and add setExporterTimeout() with a default equal to the export interval
  (#​8827)

Exporters

• Logging: Fall back to the observed timestamp in SystemOutLogRecordExporter when the timestamp is unset
  (#​8944)
• OTLP: Close the JDK HTTP response body on unsupported Content-Encoding
  (#​8962)
• OTLP: Match the Host header case-insensitively in the managed-channel gRPC sender
  (#​8957)
• OTLP: Fix exporter metric server attributes for hosts that java.net.URI cannot parse
  (#​8941)
• OTLP: Pass the original exception to the JDK HTTP sender's error callback
  (#​8963)
• OTLP: Retry OkHttp gRPC exports on the current thread to avoid rejection by bounded executors
  (#​8965)
• OTLP: Restore per-attempt retry logging in the OkHttp gRPC sender
  (#​8967)
• OTLP: Correct exporter builder Javadoc
  (#​8996)
• OTLP: Accept 0 as no limit for maximum request body and message sizes
  (#​8945)
• OTLP: gRPC exporter internal telemetry uses rpc.status_code instead of
  rpc.response.status.code when InternalTelemetryVersion is set to LATEST
  (#​9007)
• Prometheus: Give exemplar trace_id and span_id precedence over filtered attributes
  (#​8959)

Extensions

• BREAKING Incubator: Change SamplingIntent.create() and getTraceStateUpdater() from Function to BiFunction accepting the final SamplingDecision, and fix consistent sampling corner cases
  (#​8952)
• Autoconfigure: Match environment variables for configuration keys containing underscores
  (#​8933, #​8951)
• Autoconfigure: Support PeriodicMetricReader batch sizes through otel.metric.export.max.batch.size
  (#​8935)
• Autoconfigure: Correct SPI Javadoc
  (#​8900)

Testing

• Add fluent metric point assertions to MetricAssert
  (#​8994)
• Add a builder supporting aggregation temporality selectors to InMemoryMetricExporter
  (#​8993)