Merge pull request #120 from Doist/brandon/utcnow

Remove uses of utcnow, update deps for python 3.12

Author: brandon-doist

.pre-commit-config.yaml

@@ -1,5 +1,5 @@
 default_language_version:
-  python: python3.11
+  python: python3.12
 
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks

mypy.ini

@@ -1,5 +1,5 @@
 [mypy]
-python_version = 3.11
+python_version = 3.12
 follow_imports = silent
 scripts_are_modules = true
 namespace_packages = true