Mark upcoming branch as dev or beta version

What do you think?

pyproject.toml

@@ -8,7 +8,7 @@ build-backend = "setuptools.build_meta"
 [project]
 name = "ops-scenario"
 
-version = "6.1.6"
+version = "7.0.0"
 
 authors = [
     { name = "Pietro Pasotti", email = "pietro.pasotti@canonical.com" }