feat: bump starlette dependency to 1.x (#2297)

Author: pgrayy

pyproject.toml

@@ -68,8 +68,8 @@ a2a = [
     "a2a-sdk[sql]>=0.3.0,<0.4.0",
     "uvicorn>=0.34.2,<1.0.0",
     "httpx>=0.28.1,<1.0.0",
-    "fastapi>=0.115.12,<1.0.0",
-    "starlette>=0.46.2,<1.0.0",
+    "fastapi>=0.133.0,<1.0.0",
+    "starlette>=1.0.0,<2.0.0",
 ]
 
 bidi = [