update build system, add papermill

Author: connorferster

pyproject.toml

@@ -6,12 +6,14 @@ readme = "README.md"
 authors = [
     { name = "Connor Ferster", email = "[email protected]" }
 ]
-requires-python = ">=3.13"
-dependencies = []
+requires-python = ">=3.10"
+dependencies = [
+    "papermill>=2.6.0",
+]
 
 [project.scripts]
 millrun = "millrun:main"
 
 [build-system]
-requires = ["hatchling"]
-build-backend = "hatchling.build"
+requires = ["flit_core >=3.2,<4"]
+build-backend = "flit_core.buildapi"