temp fix https://github.com/crate/crate-python/issues/708

src/common/tcp_connector.py

@@ -0,0 +1,13 @@
+import ssl
+import certifi
+import aiohttp
+
+ssl_context = ssl.create_default_context(cafile=certifi.where())
+connector = None
+
+
+async def get_tcp_connector():
+    global connector
+    if connector is None:
+        connector = aiohttp.TCPConnector(ssl=ssl_context)
+    return connector