Upload to release Actions step consistently failing on Windows runners

[cboulay]

With 1.16.2 released, I keep trying to re-run the GH Actions workflow and keep getting errors uploading the artifacts.
e.g.,
https://github.com/sccn/liblsl/actions/runs/5101895509/jobs/9176126112

I don't know what's different between this working Ubuntu 22.04 example

And this non-working Windows-x64 example

The env: UPLOAD_URL: looks a little bit suspect to me but it works on the other targets.

Edit: I was reading out of order. the env: is setup first but the bash script removes the tail. Not suspect.

[cboulay]

And 18.04 uploads are failing because of cert errors.

[cboulay]

Same problem in LabRecorder:
https://github.com/labstreaminglayer/App-LabRecorder/actions/runs/5105264776/jobs/9176742719