Merge branch 'release/4.0.0.dev7' into 'master'

Release 4.0.0.dev7

See merge request !1457

pyproject.toml

 [tool.poetry]
 name = "AlekSIS-Core"
-version = "4.0.0.dev6"
+version = "4.0.0.dev8"
 packages = [
     { include = "aleksis" }
 ]

[Hangzhi Yu]

why is this saying version = "4.0.0.dev8"?

[Jonathan Weth]

Because this is the version we are now working on.