Upgrade project from .NET 3.0 to .NET 9.0

[multitudes]

Migrated CANAPE.Core from .NET Standard 2.0/.NET Core 2.0/3.0 to .NET 9.0.

1. CANAPE.csproj - Changed from netstandard2.0 to net9.0
2. CANAPE.Net.csproj - Changed from netstandard2.0 to net9.0
3. CANAPE.Security.csproj - Changed from netstandard2.0 to net9.0
4. CANAPE.Net.Protocols.csproj - Changed from netstandard2.0 to net9.0
5. CANAPE.Net.Templates.csproj - Changed from netstandard2.0 to net9.0
6. CANAPE.Cli.csproj - Changed from netcoreapp3.0; netcoreapp2.0; net471 to net9.0
7. CANAPE.Cli.Lib.csproj - Changed from netstandard2.0 to net9.0

Testing

The migration was tested by:

1. Building the entire solution successfully
2. Running the SOCKS proxy example without errors
3. Verifying the TCP listener starts and accepts connections properly