Update dependency django-polymorphic to v3

This MR contains the following updates:

Package	Type	Update	Change
django-polymorphic	dependencies	major	^2.1.2 -> ^3.0.0

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poetry.lock

@@ -732,10 +732,10 @@ description = "Seamless polymorphic inheritance for Django models"
 name = "django-polymorphic"
 optional = false
 python-versions = "*"
-version = "2.1.2"
+version = "3.0.0"
 
 [package.dependencies]
-Django = ">=1.11"
+Django = ">=2.1"
 
 [[package]]
 category = "main"
@@ -2147,7 +2147,7 @@ celery = ["Celery", "django-celery-results", "django-celery-beat", "django-celer
 ldap = ["django-auth-ldap"]
 
 [metadata]
-content-hash = "c914df99dc2cd3722b54f635d716e498ff7da050a867e85b9e85a8e5fae9949e"
+content-hash = "c0631e45178a4739db4cf5dac86b52ff18789dc07ffcfaf1f5af4c557140aeba"
 lock-version = "1.0"
 python-versions = "^3.7"
 
@@ -2422,8 +2422,8 @@ django-phonenumber-field = [
     {file = "django_phonenumber_field-3.0.1-py3-none-any.whl", hash = "sha256:1ab19f723928582fed412bd9844221fa4ff466276d8526b8b4a9913ee1487c5e"},
 ]
 django-polymorphic = [
-    {file = "django-polymorphic-2.1.2.tar.gz", hash = "sha256:6e08a76c91066635ccb7ef3ebbe9a0ad149febae6b30be2579716ec16d3c6461"},
-    {file = "django_polymorphic-2.1.2-py2.py3-none-any.whl", hash = "sha256:0a25058e95e5e99fe0beeabb8f4734effe242d7b5b77dca416fba9fd3062da6a"},
+    {file = "django-polymorphic-3.0.0.tar.gz", hash = "sha256:9d886f19f031d26bb1391c055ed9be06fb226a04a4cec1842b372c58873b3caa"},
+    {file = "django_polymorphic-3.0.0-py2.py3-none-any.whl", hash = "sha256:73b75eb44ea302bd32820f8661e469509d245ce7f7ff09cd2ad149e5c42034ff"},
 ]
 django-pwa = [
     {file = "django-pwa-1.0.10.tar.gz", hash = "sha256:07ed9dd57108838e3fe44b551a82032ca4ed76e31cb3c3e8d51604e0fe7e81e9"},