Issue with special characters

[MarcoLanghans]

https://github.com/ceterion/PackagingFramework/blob/c9562db5fb0f9f5a318cc0c62b1210f78f5642d9/PackagingFramework/PackagingFramework.psm1#L1504

Currently there is a problem with german special characters (eg. ä, ö, ü) to fix that a additional line must be added to the framework

old version:

$body = $body| ConvertTo-Json -Compress
Write-log "Invoke-WebRequest -Uri `"$ServiceURL/api/edit-installsequence`" -Method Post -Body $body -ContentType `"application/json`" -

fixed version:

$body = $body| ConvertTo-Json -Compress
$body = [System.Text.Encoding]::UTF8.GetBytes($body)
Write-log "Invoke-WebRequest -Uri `"$ServiceURL/api/edit-installsequence`" -Method Post -Body $body -ContentType `"application/json`" -