[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

src/fastserve/core.py

@@ -80,8 +80,10 @@ def run_server(
         background: bool = False,
     ):
         import uvicorn
+
         if background:
             import threading
+
             t = threading.Thread(target=uvicorn.run, args=(self.app,), daemon=True)
             t.start()
             return t