Update Core dependency and bump version

pyproject.toml

 [tool.poetry]
 name = "AlekSIS-App-Kolego"
-version = "0.1"
+version = "0.1.dev0"
 packages = [
     { include = "aleksis" }
 ]
@@ -34,7 +34,7 @@ url = "https://edugit.org/api/v4/projects/461/packages/pypi/simple"
 priority = "supplemental"
 [tool.poetry.dependencies]
 python = "^3.10"
-aleksis-core = "^3.0"
+aleksis-core = "^4.0.0.dev0"
 
 [tool.poetry.plugins."aleksis.app"]
 kolego = "aleksis.apps.kolego.apps:DefaultConfig"