[dagster-ge] Drop python 3.9 support (#25637)

## Summary & Motivation

Second order dependencies prevent `dagster-ge` from being supported on
3.9.

## How I Tested These Changes

Existing test suite.

## Changelog

[dagster-ge] The minimum Python version for `dagster-ge` is now 3.10.

.buildkite/dagster-buildkite/dagster_buildkite/steps/packages.py

@@ -310,6 +310,9 @@ def k8s_extra_cmds(version: str, _) -> List[str]:
     ),
     PackageSpec(
         "examples/with_great_expectations",
+        unsupported_python_versions=[
+            AvailablePythonVersion.V3_9,
+        ],
     ),
     PackageSpec(
         "examples/with_pyspark",
@@ -636,6 +639,9 @@ def tox_factors_for_folder(tests_folder_name: str) -> List[str]:
     ),
     PackageSpec(
         "python_modules/libraries/dagster-ge",
+        unsupported_python_versions=[
+            AvailablePythonVersion.V3_9,
+        ],
     ),
     PackageSpec(
         "python_modules/libraries/dagster-k8s",

python_modules/libraries/dagster-ge/setup.py

@@ -30,7 +30,7 @@ def get_version() -> str:
     ],
     packages=find_packages(exclude=["dagster_ge_tests*"]),
     include_package_data=True,
-    python_requires=">=3.9,<3.13",
+    python_requires=">=3.10,<3.13",
     install_requires=[
         f"dagster{pin}",
         f"dagster-pandas{pin}",