Markdown Preview powershell syntax highlighting bugged

[AMDphreak]

Does this issue occur when all extensions are disabled?: Yes

• VS Code Version: 1.96.4
• OS Version: Windows 11 Pro V 23H2 build 22631.4751

Steps to Reproduce:

1. Create markdown document
2. Insert code block with pwsh or powershell syntax highlighting.

   ./voice-transcriber.exe -key "your-openai-api-key" -file "path/to/audio/file.m4a" -output "output.txt"
   

The 'sh' syntax highlighting is more accurate for powershell in this case than the 'pwsh' highlighting. This shouldn't be the case.