Increase minimum ensureconda version for py3.12 compatibility

Prior to ensureconda v1.4.4 distutils is used, which was removed in
python 3.12. This prevents conda-lock running under python newer
than 3.11, so the minimum version of ensureconda is increased.

Fixes #542

pyproject.toml

@@ -30,7 +30,7 @@ dependencies = [
     # conda-lock dependencies
     "click >=8.0",
     "click-default-group",
-    "ensureconda >=1.3",
+    "ensureconda >=1.4.4",
     "gitpython >=3.1.30",
     "jinja2",
     "pydantic >=1.10",