Update project.requires-python to >=3.10

Author: srittau

pyproject.toml

@@ -3,7 +3,7 @@
 # https://github.com/astral-sh/uv/issues/8666
 name = "typeshed"
 version = "0"
-requires-python = ">=3.9" # Minimum version to run tests, used by uv run
+requires-python = ">=3.10" # Minimum version to run tests, used by uv run
 
 [tool.black]
 line-length = 130