drop python 3.9

Author: d-v-b

pyproject.toml

@@ -7,7 +7,7 @@ name = "cellmap-schemas"
 dynamic = ["version"]
 description = 'Schemas for data used by the Cellmap project team at Janelia Research Campus.'
 readme = "README.md"
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 license = "MIT"
 keywords = ["cellmap", "ngff", "n5", "zarr"]
 authors = [
@@ -45,7 +45,7 @@ dependencies = [
 ]
 
 [[tool.hatch.envs.test.matrix]]
-python = ["3.9", "3.10", "3.11"]
+python = ["3.10", "3.11", "3.12"]
 
 [tool.hatch.envs.test.scripts]
 run-coverage = "pytest --cov-config=pyproject.toml --cov=pkg --cov=tests"