🐛 make throttle lazy init

Author: yanyongyu

githubkit/throttling.py

@@ -35,9 +35,15 @@ async def async_acquire(self, request: httpx.Request) -> AsyncGenerator[None, An
 class LocalThrottler(BaseThrottler):
     def __init__(self, max_concurrency: int) -> None:
         self.max_concurrency = max_concurrency
-        self.semaphore = threading.Semaphore(max_concurrency)
+        self._semaphore: Optional[threading.Semaphore] = None
         self._async_semaphore: Optional[anyio.Semaphore] = None
 
+    @property
+    def semaphore(self) -> threading.Semaphore:
+        if self._semaphore is None:
+            self._semaphore = threading.Semaphore(self.max_concurrency)
+        return self._semaphore
+
     @property
     def async_semaphore(self) -> anyio.Semaphore:
         if self._async_semaphore is None: