🩹(backend) get current release from pyproject.toml

"get_release" was returning NA, we fixed it by
getting the version from pyproject.toml, to do so we
use tomllib
Since tomllib is a native library from Python 3.11,
we bump the required version to 3.11 on the pyproject.toml.

src/backend/impress/settings.py

@@ -10,8 +10,8 @@ For the full list of settings and their values, see
 https://docs.djangoproject.com/en/3.1/ref/settings/
 """
 
-import json
 import os
+import tomllib
 
 from django.utils.translation import gettext_lazy as _
 
@@ -27,19 +27,12 @@ DATA_DIR = os.path.join("/", "data")
 def get_release():
     """
     Get the current release of the application
-
-    By release, we mean the release from the version.json file à la Mozilla [1]
-    (if any). If this file has not been found, it defaults to "NA".
-
-    [1]
-    https://github.com/mozilla-services/Dockerflow/blob/master/docs/version_object.md
     """
-    # Try to get the current release from the version.json file generated by the
-    # CI during the Docker image build
     try:
-        with open(os.path.join(BASE_DIR, "version.json"), encoding="utf8") as version:
-            return json.load(version)["version"]
-    except FileNotFoundError:
+        with open(os.path.join(BASE_DIR, "pyproject.toml"), "rb") as f:
+            pyproject_data = tomllib.load(f)
+        return pyproject_data["project"]["version"]
+    except (FileNotFoundError, KeyError):
         return "NA"  # Default: not available