Bump version and dependencies

pyproject.toml

 [tool.poetry]
 name = "AlekSIS-App-Stoelindeling"
-version = "1.0.3.dev0"
+version = "2.0.dev0"
 packages = [
     { include = "aleksis" }
 ]
@@ -30,8 +30,8 @@ secondary = true
 
 [tool.poetry.dependencies]
 python = "^3.9"
-aleksis-core = "^2.8"
-aleksis-app-chronos = "^2.0"
+aleksis-core = "^3.0.dev3"
+aleksis-app-chronos = "^3.0.dev1"
 
 [tool.poetry.dev-dependencies]
 aleksis-builddeps = "*"