chore: drop annotation on empty lists, now unneeded

If needed, it is considered wrong anyway, because it should be annotated
as class attribute.

diff --git a/psycopg/psycopg/pq/_pq_ctypes.py b/psycopg/psycopg/pq/_pq_ctypes.py
index f3a7b143fe3e617464b0096cdaa8e52449fef56e..b2da35f7b0f0fdbe4ae299c6fa261523447aa8b7 100644 (file)
--- a/psycopg/psycopg/pq/_pq_ctypes.py
+++ b/psycopg/psycopg/pq/_pq_ctypes.py
@@ -58,11 +58,11 @@ Oid = c_uint
 
 
 class PGconn_struct(Structure):
-    _fields_: list[tuple[str, type]] = []
+    _fields_ = []
 
 
 class PGresult_struct(Structure):
-    _fields_: list[tuple[str, type]] = []
+    _fields_ = []
 
 
 class PQconninfoOption_struct(Structure):
@@ -86,11 +86,11 @@ class PGnotify_struct(Structure):
 
 
 class PGcancelConn_struct(Structure):
-    _fields_: list[tuple[str, type]] = []
+    _fields_ = []
 
 
 class PGcancel_struct(Structure):
-    _fields_: list[tuple[str, type]] = []
+    _fields_ = []
 
 
 class PGresAttDesc_struct(Structure):