Fix image download failure

[andygrunwald]

This PR should fix things like

Error: Get "http://media.gamedevpodcast.de/logo_2800.png": context deadline exceeded (Client.Timeout exceeded while awaiting headers)

See the latest Action failure run: https://github.com/EngineeringKiosk/GermanTechPodcasts/actions/runs/3345035908/jobs/5540077014