TER Upload failed

Summary

Uploading new extension releases to TER failed.

Steps to reproduce

Building release as everytime
Try to upload extension with helhum/ter-client
see failure message

In Connection.php line 52:
  Error Fetching http headers

Example URL

https://travis-ci.com/hoogi91/spreadsheets/jobs/273246766

What is the current bug behavior?

Upload to TER fails due to an error in SOAP connection.

What is the expected correct behavior?

Extension is successfully uploaded to TER

Acceptence Criterias

New tag of extension is uploaded

Relevant logs and/or screenshots

The error directly occurrs for the soap call in helhum/ter-client: https://github.com/helhum/ter-client/blob/master/src/Connection.php#L52

Possible fixes

Maybe this is related to default_socket_timeout in the executing php installation but the upload was working before this issue without any modifications on the current php installation