fix(nginx): set proxy_http_version to 1.1

This sets the `proxy_http_version` to `1.1`.

The reason this change should be implemented is that when this is deployed in a Kubernetes environment with Istio, the proxy request fails with HTTP error 426 as the HTTP version is too low for envoy to handle. Setting it to `1.1` will solve the issue.

bench/config/templates/nginx.conf

@@ -91,6 +91,7 @@ server {
 	}
 
 	location @webserver {
+		proxy_http_version 1.1;
 		proxy_set_header X-Forwarded-For $remote_addr;
 		proxy_set_header X-Forwarded-Proto $scheme;
 		proxy_set_header X-Frappe-Site-Name {{ site_name }};