Update dependency django-invitations to v2

This MR contains the following updates:

Package	Type	Update	Change
django-invitations	dependencies	major	^1.9.3 -> ^2.0.0

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pyproject.toml

@@ -106,7 +106,7 @@ django-cachalot = "^2.3.2"
 django-prometheus = "^2.1.0"
 django-model-utils = "^4.0.0"
 bs4 = "^0.0.1"
-django-invitations = "^1.9.3"
+django-invitations = "^2.0.0"
 django-cleavejs = "^0.1.0"
 django-allauth = "^0.51.0"
 django-uwsgi-ng = "^1.1.0"