Revert "psycopg2: Accept Composable in place of query string (#7494)"

This reverts commit b78f0c2.

Author: JelleZijlstra

stubs/psycopg2/psycopg2/_psycopg.pyi

@@ -5,7 +5,6 @@ from typing import Any, TypeVar, overload
 
 import psycopg2
 import psycopg2.extensions
-from psycopg2.sql import Composable
 
 _Vars = Sequence[Any] | Mapping[str, Any] | None
 
@@ -361,11 +360,11 @@ class cursor:
     def callproc(self, procname, parameters=...): ...
     def cast(self, oid, s): ...
     def close(self): ...
-    def copy_expert(self, sql: str | bytes | Composable, file, size=...): ...
+    def copy_expert(self, sql, file, size=...): ...
     def copy_from(self, file, table, sep=..., null=..., size=..., columns=...): ...
     def copy_to(self, file, table, sep=..., null=..., columns=...): ...
-    def execute(self, query: str | bytes | Composable, vars: _Vars = ...) -> None: ...
-    def executemany(self, query: str | bytes | Composable, vars_list: Iterable[_Vars]) -> None: ...
+    def execute(self, query: str | bytes, vars: _Vars = ...) -> None: ...
+    def executemany(self, query: str | bytes, vars_list: Iterable[_Vars]) -> None: ...
     def fetchall(self) -> list[tuple[Any, ...]]: ...
     def fetchmany(self, size=...) -> list[tuple[Any, ...]]: ...
     def fetchone(self) -> tuple[Any, ...] | Any: ...