Update Distro to latest OTel version

[jeremydvoss]

Description

Now that the fix to the instrumentation breaking change is merged, we can finally update the OTel version for the distro. Also removing Python 3.8 as it is no longer supported by OTel.

All SDK Contribution checklist:

• The pull request does not introduce [breaking changes]
• CHANGELOG is updated for new features, bug fixes or other significant changes.
• I have read the contribution guidelines.

General Guidelines and Best Practices

• Title of the pull request is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For more information on cleaning up the commits in your PR, see this page.

Testing Guidelines

• Pull request includes test coverage for the included changes.

[Copilot]

Pull Request Overview

This PR updates the Azure Monitor OpenTelemetry distro to use the latest OpenTelemetry version (1.36.0) and removes Python 3.8 support. The update was previously blocked due to a breaking change in OTel instrumentation libraries that has now been resolved with a fix in the upstream repository.

Key changes:

• Remove Python 3.8 classifier and support
• Update all OpenTelemetry instrumentation dependencies from ~0.49b0-0.53b0 range to ~0.57b0
• Upgrade opentelemetry-sdk from <1.32,>=1.28.0 to ~1.36.0
• Update opentelemetry-resource-detector-azure from ~0.1.4 to ~0.2.0

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
sdk/monitor/azure-monitor-opentelemetry/setup.py	Updates dependency versions and removes Python 3.8 classifier
sdk/monitor/azure-monitor-opentelemetry/CHANGELOG.md	Documents the OpenTelemetry version update and Python 3.8 removal