Pins Pydantic to version 1, adds Python 3.11 (#391)

* Pins Pydantic to version 1

* More specific pin

Author: JasonWeill

pyproject.toml

@@ -26,12 +26,13 @@ classifiers = [
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
 ]
 dependencies = [
     "jupyter_server>=1.6,<3",
     "traitlets",
     "nbconvert",
-    "pydantic",
+    "pydantic~=1.10",
     "sqlalchemy<2",
     "croniter",
     "pytz",