Switch from sha256sum to sha512sum

Not needed but it will be consistant with the launcher itself

src/app/types/LauncherUpdate.ts

@@ -3,5 +3,5 @@ export interface LauncherUpdate {
     releaseDate: number
     downloadUrls: string[]
     platforms: string[]
-    sha256sums: string[]
+    sha512sums: string[]
 }