Avoid unnecessary forward refs in class definitions (#10124)

stdlib/multiprocessing/synchronize.pyi

@@ -14,9 +14,6 @@ class Barrier(threading.Barrier):
         self, parties: int, action: Callable[[], object] | None = None, timeout: float | None = None, *ctx: BaseContext
     ) -> None: ...
 
-class BoundedSemaphore(Semaphore):
-    def __init__(self, value: int = 1, *, ctx: BaseContext) -> None: ...
-
 class Condition(AbstractContextManager[bool]):
     def __init__(self, lock: _LockLike | None = None, *, ctx: BaseContext) -> None: ...
     def notify(self, n: int = 1) -> None: ...
@@ -36,6 +33,14 @@ class Event:
     def clear(self) -> None: ...
     def wait(self, timeout: float | None = None) -> bool: ...
 
+# Not part of public API
+class SemLock(AbstractContextManager[bool]):
+    def acquire(self, block: bool = ..., timeout: float | None = ...) -> bool: ...
+    def release(self) -> None: ...
+    def __exit__(
+        self, __exc_type: type[BaseException] | None, __exc_val: BaseException | None, __exc_tb: TracebackType | None
+    ) -> None: ...
+
 class Lock(SemLock):
     def __init__(self, *, ctx: BaseContext) -> None: ...
 
@@ -45,10 +50,5 @@ class RLock(SemLock):
 class Semaphore(SemLock):
     def __init__(self, value: int = 1, *, ctx: BaseContext) -> None: ...
 
-# Not part of public API
-class SemLock(AbstractContextManager[bool]):
-    def acquire(self, block: bool = ..., timeout: float | None = ...) -> bool: ...
-    def release(self) -> None: ...
-    def __exit__(
-        self, __exc_type: type[BaseException] | None, __exc_val: BaseException | None, __exc_tb: TracebackType | None
-    ) -> None: ...
+class BoundedSemaphore(Semaphore):
+    def __init__(self, value: int = 1, *, ctx: BaseContext) -> None: ...