fix: multiline absolute urls for nupkg

[zorn-v]

Currently squirrel updates seems not working at all.
For example url https://update.electronjs.org/zorn-v/shareon-local-app/win32-x64/1.0.0/RELEASES returns

5417D2238661918281F026FFEC8E74821549646E https://github.com/zorn-v/shareon-local-app/releases/download/v1.0.1/shareon_local_app-1.0.0-full.nupkg 98510713
C2F97B323A29A6FE36DA9633D2832BDBB6310CA5 shareon_local_app-1.0.1-delta.nupkg 70277894
07F3EFA74A2B8768C816B15182994C64DB340EB2 shareon_local_app-1.0.1-full.nupkg 98510705

But squirrel want to download 1.0.1 version.
And we get something like this in Squirrel-Update.log

[26.05.23 14:11:13] info: FileDownloader: Downloading url: https://update.electronjs.org/zorn-v/shareon-local-app/win32-x64/1.0.0/RELEASES?id=shareon_local_app&localVersion=1.0.0&arch=amd64
[26.05.23 14:11:14] info: FileDownloader: Downloading file: https://update.electronjs.org/zorn-v/shareon-local-app/win32-x64/1.0.0/shareon_local_app-1.0.1-delta.nupkg
[26.05.23 14:11:14] error: DownloadReleasesImpl: File Length should be 70277894, is 141

because https://update.electronjs.org/zorn-v/shareon-local-app/win32-x64/1.0.0/shareon_local_app-1.0.1-delta.nupkg is just json but not actual file

[zorn-v]

It applicable for releases with delta nupkg (e.g. with remoteReleases for @electron-forge/maker-squirrel).
Without it all works fine as there is only one nupkg in RELEASES file