style: Fixes unnecessary-collection-call (C408) for ctypesgen

Only applies fixes to non-empty collections by  `ruff check --select "C408" --unsafe-fixes --output-format=concise --fix` in order to limit the review scope.

python/libgrass_interface_generator/ctypesgen/libraryloader.py

@@ -67,7 +67,7 @@ class Lookup:
 
         def __init__(self, path):
             super(LibraryLoader.Lookup, self).__init__()
-            self.access = dict(cdecl=ctypes.CDLL(path, self.mode))
+            self.access = {"cdecl": ctypes.CDLL(path, self.mode)}
 
         def get(self, name, calling_convention="cdecl"):
             """Return the given name according to the selected calling convention"""