OpenWrt package downloads are now https, while they used to be http.
Not sure about your config, or previous versions that you have used, but wget clearly fails to download with HTTPS.
It is possible that you have earlier had just the default uclient-fetch installed and no wget at all, (and uclient-fetch acts as a small wget replacement if there is no real wget). Now some new package of yours has installed wget as a dependency and the nossl variant has been installed. Something like that.