.NET aggregate checksum files are formatted incorrectly

Examples:
- https://builds.dotnet.microsoft.com/dotnet/checksums/8.0.17-sha.txt
- https://builds.dotnet.microsoft.com/dotnet/checksums/9.0.6-sha.txt

### Spacing between checksum and filename

```
1308565...ecb18d5 aspnetcore-runtime-8.0.17-linux-arm.tar.gz
4f1a441...aced3c5 aspnetcore-runtime-8.0.17-linux-arm64.tar.gz
...
```

There is one space between the checksum and the filename. `sha512sum`'s output has two spaces. From `man sha512sum`:

> When checking, the input should be a former output of this program. The default mode is to print a line with: checksum, a space, a character indicating input mode ('*' for binary, ' ' for text or where binary is insignificant), and name for each FILE.
> ...
> There is no difference between binary mode and text mode on GNU systems.

### Line endings

Line endings are CRLF, and not LF. On some Linux systems this causes the CR to interpreted as part of the filename, resulting in no files being verified. Running the file through `sed -i 's/\r$//'` fixes this, but that should not be necessary.