Make compatible with PS7

[muravsky]

I've found out, that current code is not compatible with PS7 slightly.

Changing
$certbytes | Set-Content -Encoding Byte -Path $pfxPath -ea Stop
to
$certbytes | Set-Content -AsByteStream -Path $pfxPath -ea Stop

Fixed the issue for me.
Please consider changing it in repository.

[Kryptox95]

Thank you for your input! With your advice, I'm now able to utilize it in PS7. Nonetheless, I've discovered that the following if-condition is particularly beneficial for individuals who are still operating in PS5.

if ($PSVersionTable.PSVersion.Major -eq 7) {
$certbytes | Set-Content -AsByteStream -Path $pfxPath -ea Stop
} elseif ($PSVersionTable.PSVersion.Major -eq 5) {
$certbytes | Set-Content -Encoding Byte -Path $pfxPath -ea Stop
} else {
Write-Host "No Supported PS Version"
}

[J0F3]

#29 should fix that.