fix: syntax error with PowerShell 5.1

[riywo]

PowerShell 5.1 is old but still in support because it's a part of Windows 10/11: PowerShell/PowerShell#16971

So, we should keep supporting PowerShell 5.1 until its EOL.

For now, this tiny invalid syntax causes an error with 5.1 and this commit is fixing it.

Error

iex : At line:178 char:50
+       7z.exe x -txz "${src}" -so > "${temp_tar}" && 7z.exe x -ttar "$ ...
+                                                  ~~
The token '&&' is not a valid statement separator in this version.
At line:1 char:61
+ Get-Content .\toolset\shellcheck\install.ps1 | Out-String | iex
+                                                             ~~~
    + CategoryInfo          : ParserError: (:) [Invoke-Expression], ParseException
    + FullyQualifiedErrorId : InvalidEndOfLine,Microsoft.PowerShell.Commands.InvokeExpressionCommand

Follow up

• Add tests with PowerShell 5.1 #5

[opsbr-bot]

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