Update dependency azure-monitor-opentelemetry to v1.8.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
azure-monitor-opentelemetry (source)	==1.8.7 → ==1.8.8

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Release Notes

Azure/azure-sdk-for-python (azure-monitor-opentelemetry)

v1.8.8

Compare Source

1.8.8 (2026-05-14)

Features Added

• Move AZURE_MONITOR_DISTRO_VERSION env var assignment before exporter imports
  (#​46869)
• Set AZURE_MONITOR_DISTRO_VERSION environment variable to pass distro version to the exporter
  (#​46666)
• Register GenAI main-agent attribution processors to automatically propagate
  microsoft.gen_ai.main_agent.* attributes in multi-agent GenAI systems per spec
  (#​46703)

Breaking Changes

• Dropped support for Python 3.9. This package now supports Python 3.10+. Follows upstream otel dropping support
  (#​46695)

Other Changes

• Remove deprecated events packages.
  (#​45684)

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