Bump version to 2.0.1.dev0 and update (dev) dependencies

pyproject.toml

 [tool.poetry]
 name = "AlekSIS-App-Hjelp"
-version = "2.0b0"
+version = "2.0.1.dev0"
 packages = [
     { include = "aleksis" }
 ]
@@ -16,7 +16,7 @@ repository = "https://edugit.org/AlekSIS/official/AlekSIS-App-Hjelp"
 documentation = "https://aleksis.org/AlekSIS/docs/html/"
 keywords = ["SIS", "education", "school", "support", "feedback"]
 classifiers = [
-    "Development Status :: 4 - Beta",
+    "Development Status :: 5 - Production/Stable",
     "Environment :: Web Environment",
     "Framework :: Django :: 3.0",
     "Intended Audience :: Education",
@@ -31,10 +31,10 @@ secondary = true
 
 [tool.poetry.dependencies]
 python = "^3.9"
-aleksis-core = "^2.0rc"
+aleksis-core = "^2.0"
 
 [tool.poetry.dev-dependencies]
-aleksis-builddeps = "*"
+aleksis-builddeps = "^5"
 
 [tool.poetry.plugins."aleksis.app"]
 hjelp = "aleksis.apps.hjelp.apps:HjelpConfig"