PackageList "add package" action is not detecting packages correctly

[daveverwer]

This first happened with these two pull requests:

• https://github.com/SwiftPackageIndex/PackageList/pull/6677
• https://github.com/SwiftPackageIndex/PackageList/pull/7006

Just now it happened with this one, too:

• https://github.com/SwiftPackageIndex/PackageList/pull/7186

The actions run for that PR is:

• https://github.com/SwiftPackageIndex/PackageList/actions/runs/9363934435/job/25775805765

Nothing obviously wrong, but there's clearly something about this format that the script isn't coping with. I noticed it does not have the `.git' extension, but I'm sure we cope with that, so it's possibly some of the other text surrounding the URL that's upsetting it.