[project meta,pdm] move version information to config package

VERSION.py

@@ -1,3 +0,0 @@
-# calver schema YYYY.0M.Micro (see also https://calver.org/#scheme)
-
-__version__ = "2025.03.3"

config/__init__.py

@@ -0,0 +1,3 @@
+# calver schema YYYY.0M.Micro (see also https://calver.org/#scheme)
+
+__version__ = "2025.03.3"

pyproject.toml

@@ -35,7 +35,6 @@ show_missing = true
 [tool.coverage.run]
 omit = [
   "*/migrations/*",
-  "VERSION.py",
   "manage.py",
   "config/[aw]sgi.py",
 ]
@@ -49,4 +48,4 @@ build-backend = "pdm.backend"
 
 [tool.pdm.version]
 source = "file"
-path = "./VERSION.py"
+path = "config/__init__.py"