checkver.ps1 does not work on Powershell 6.1.0

[se35710]

https://github.com/lukesampson/scoop/blob/bc927a53f96137b501c154937b9dc2819a34eb67/bin/checkver.ps1#L34-L39

Get-ChildItem "." "*.json" | ForEach-Object { echo "$_" } returns filenames on older pwsh, but on Powershell 6.1.0 full path is returned:

Linux:

PS /home/user/scoop-extras> Get-ChildItem "." "*.json" | ForEach-Object { echo "$_" }
/home/user/scoop-extras/advancedrenamer.json
/home/user/scoop-extras/aida64extreme.json
[...]

Windows:

PS C:\Users\user\scoop-extras> Get-ChildItem "." "*.json" | ForEach-Object { echo "$_" }
C:\Users\user\scoop-extras\advancedrenamer.json
C:\Users\user\scoop-extras\aida64extreme.json
[...]

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