Auto merge of #7318 - reitermarkus:ssl-connect-error, r=alexcrichton

Retry on SSL Connect Error.

I have been getting a bunch of spurious `[35] SSL connect error`s on Azure Pipelines, so these should be treated as spurious errors.

src/cargo/util/network.rs

@@ -51,6 +51,7 @@ fn maybe_spurious(err: &Error) -> bool {
                 || curl_err.is_operation_timedout()
                 || curl_err.is_recv_error()
                 || curl_err.is_http2_stream_error()
+                || curl_err.is_ssl_connect_error()
             {
                 return true;
             }