fix: Upgrade to Python 3.12

[faucomte97]

This change is 

[SKairinos]

Reviewed 19 of 19 files at r1, all commit messages.
Reviewable status: all files reviewed, 3 unresolved discussions (waiting on @faucomte97)

---

codeforlife/tests/model_serializer.py line 128 at r1 (raw file):

                data[field] = getattr(value, "id")

        self.assertEqual(model_to_dict(model), {**model_to_dict(model), **data})

Instead, replace this with

model_dict = {
    field: value
    for field, value in model.__dict__.items()
    if not field.startswith("_")
}
self.assertDictEqual(model_dict | data, model_dict)

Code quote:

self.assertEqual(model_to_dict(model), {**model_to_dict(model), **data})

---

codeforlife/tests/model_view_set.py line 748 at r1 (raw file):

        (self.assertEqual if contains_subset else self.assertDictEqual)(
            json_model, serialized_model
        )

Instead, replace this with

self.assertDictEqual(
            serialized_model | json_model if contains_subset else json_model,
            serialized_model,
        )

Code quote:

        (self.assertEqual if contains_subset else self.assertDictEqual)(
            json_model, serialized_model
        )

---

codeforlife/tests/model_view_set.py line 824 at r1 (raw file):

            actual_serializer_context,
            actual_serializer_context | serializer_context,
        )

Instead, replace this with

self.assertDictEqual(
            actual_serializer_context | serializer_context,
            actual_serializer_context,
        )

Code quote:

        self.assertEqual(
            actual_serializer_context,
            actual_serializer_context | serializer_context,
        )

[faucomte97]

Reviewable status: 17 of 19 files reviewed, 3 unresolved discussions (waiting on @SKairinos)

---

codeforlife/tests/model_serializer.py line 128 at r1 (raw file):

Previously, SKairinos (Stefan Kairinos) wrote…

Instead, replace this with

model_dict = {
    field: value
    for field, value in model.__dict__.items()
    if not field.startswith("_")
}
self.assertDictEqual(model_dict | data, model_dict)

Done.

---

codeforlife/tests/model_view_set.py line 748 at r1 (raw file):

Previously, SKairinos (Stefan Kairinos) wrote…

Instead, replace this with

self.assertDictEqual(
            serialized_model | json_model if contains_subset else json_model,
            serialized_model,
        )

Done.

---

codeforlife/tests/model_view_set.py line 824 at r1 (raw file):

Previously, SKairinos (Stefan Kairinos) wrote…

Instead, replace this with

self.assertDictEqual(
            actual_serializer_context | serializer_context,
            actual_serializer_context,
        )

Done.

[SKairinos]

Reviewed 1 of 2 files at r2, 2 of 3 files at r3, 1 of 1 files at r4, all commit messages.
Reviewable status: complete! all files reviewed, all discussions resolved (waiting on @faucomte97)