Update grpcweb.py

Author: cdecker

libs/gl-testing/gltesting/grpcweb.py

@@ -180,7 +180,6 @@ def proxy(self, request: Request):
         # Load TLS client cert info client
         ctx = httpx.create_ssl_context(
             verify=ca_path,
-            http2=True,
             cert=(
                 node.identity.cert_chain_path,
                 node.identity.private_key_path,