Revert velopack

Because even if you somehow bypass the breakage that bricks your install
by installing the missing libssl-1.0 or whatever
(ppy#30648 (comment)),
there's another brick upstream
(ppy#30648 (comment),
velopack/velopack#355).

Can we even downgrade like this? No idea. How does one test this? No
idea. At this point I am like a headless chicken, screaming into the
void trying to restore any semblance of order into my crumbling
universe.

If this is tried and linux is still broken with the libssl garbage, then
the `osulazer-2024.1115.1-linux-x64-*.nupkg` assets should be pulled
from the release, which should be enough to stop the game from
auto-updating. Maybe the appimage itself can stay up and people can
upgrade manually if they so desire. Or maybe not. Who knows.

osu.Desktop/osu.Desktop.csproj

@@ -26,7 +26,7 @@
   <ItemGroup Label="Package References">
     <PackageReference Include="System.IO.Packaging" Version="8.0.1" />
     <PackageReference Include="DiscordRichPresence" Version="1.2.1.24" />
-    <PackageReference Include="Velopack" Version="0.0.869" />
+    <PackageReference Include="Velopack" Version="0.0.630-g9c52e40" />
   </ItemGroup>
   <ItemGroup Label="Resources">
     <EmbeddedResource Include="lazer.ico" />