feat: drop Python 3.9 support

Agent-Logs-Url: https://github.com/microsoftgraph/msgraph-sdk-python-core/sessions/1c1c3c0f-5789-4889-8936-a38229018747

Co-authored-by: ramsessanchez <63934382+ramsessanchez@users.noreply.github.com>

Author: Copilot

.github/workflows/build.yml

@@ -17,7 +17,7 @@ jobs:
     strategy:
       max-parallel: 5
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
+        python-version: ["3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v6

README.md

@@ -12,7 +12,7 @@ The Microsoft Graph Core Python Client Library contains core classes used by [Mi
 
 ## Prerequisites
 
-    Python 3.9+
+    Python 3.10+
 
 This library doesn't support [older](https://devguide.python.org/versions/) versions of Python.
 

pyproject.toml

@@ -16,14 +16,13 @@ dependencies = [
     "microsoft-kiota-http >=1.8.0,<2.0.0",
     "httpx[http2] >=0.23.0",
 ]
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 license = "MIT"
 license-files = ["LICENSE"]
 readme = "README.md"
 keywords = ["msgraph", "openAPI", "Microsoft", "Graph"]
 classifiers = [
     "Development Status :: 5 - Production/Stable",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",