github-action: bump actions/setup-dotnet from 5 to 6 - #452

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Actions workflow (codeql.yml)

• ❓  /language:csharp
• ❓  /language:go
• ❓  /language:java
• ❓  /language:javascript
• ❓  /language:python
• ❓  /language:ruby
• ❓  /language:rust

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