Remove support for python version 3.9 exporter (#46694)

* Remove support for python version 3.9

* Update CHANGELOG

* Update CHANGELOG

Author: rads-1996

sdk/monitor/azure-monitor-opentelemetry-exporter/CHANGELOG.md

@@ -9,6 +9,8 @@
   ([#46613](https://github.com/Azure/azure-sdk-for-python/pull/46613))
 
 ### Breaking Changes
+- Dropped support for Python 3.9. This package now supports Python 3.10+. [Follows upstream otel dropping support](https://github.com/open-telemetry/opentelemetry-python/pull/5076)
+  ([#46694](https://github.com/Azure/azure-sdk-for-python/pull/46694))
 
 ### Bugs Fixed
 - Fix `success` field on HTTP request telemetry resolving to an integer instead of a boolean when no status code is present

sdk/monitor/azure-monitor-opentelemetry-exporter/README.md

@@ -23,7 +23,7 @@ To use this package, you must have:
 * Azure subscription - [Create a free account][azure_sub]
 * Azure Monitor - [How to use application insights][application_insights_namespace]
 * OpenTelemetry SDK - [OpenTelemetry SDK for Python][ot_sdk_python]
-* Python 3.8 or later - [Install Python][python]
+* Python 3.10 or later - [Install Python][python]
 
 ### Instantiate the client
 

sdk/monitor/azure-monitor-opentelemetry-exporter/dev_requirements.txt

@@ -2,5 +2,5 @@
 ../../core/azure-core
 ../../core/azure-core-tracing-opentelemetry
 ../../identity/azure-identity
-aiohttp>=3.0; python_version >= '3.7'
+aiohttp>=3.0; python_version >= '3.10'
 fixedint<1.0.0,>=0.1.6

sdk/monitor/azure-monitor-opentelemetry-exporter/setup.py

@@ -59,7 +59,6 @@
         "Development Status :: 4 - Beta",
         "Programming Language :: Python",
         "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.9",
         "Programming Language :: Python :: 3.10",
         "Programming Language :: Python :: 3.11",
         "Programming Language :: Python :: 3.12",