feat: Updates to .NET 9

[kamronbatman]

Summary

• Bumps to .NET 9 with updated dependencies
• Comparing a value type against null is no longer allowed
• CI/CD now uses the version specified in global.json
• Serialization generator updated to .NET 9

[github-actions]

Qodana for .NET

It seems all right 👌

No new problems were found according to the checks applied

💡 Qodana analysis was run in the pull request mode: only the changed files were checked
☁️ View the detailed Qodana report

Detected 20 dependencies

Third-party software list

This page lists the third-party software dependencies used in ModernUO

Dependency	Version	Licenses
Argon2.Bindings	1.16.1	MIT
BouncyCastle.Cryptography	2.4.0	MIT
CommunityToolkit.HighPerformance	8.3.2	MIT
LibDeflate.Bindings	1.0.2.120	GPL-3.0-only
MailKit	4.8.0	MIT
Microsoft.Extensions.FileSystemGlobbing	9.0.0	MIT
MimeKit	4.8.0	MIT
ModernUO.CodeGeneratedEvents.Annotations	1.0.0	GPL-3.0-only
ModernUO.CodeGeneratedEvents.Generator	1.0.3.2	GPL-3.0-only
ModernUO.Serialization.Annotations	2.9.1	GPL-3.0-only
ModernUO.Serialization.Generator	2.12.1	GPL-3.0-only
Nerdbank.GitVersioning	3.6.146	MIT
PollGroup	1.6.1	BSD-3-Clause
Serilog.Sinks.Async	2.1.0	Apache-2.0
Serilog.Sinks.Console	6.0.0	Apache-2.0
Serilog	4.1.0	Apache-2.0
System.Formats.Asn1	8.0.1	MIT
System.IO.Hashing	9.0.0	MIT
System.Security.Cryptography.Pkcs	8.0.0	MIT
Zstd.Binaries	1.6.0	MIT

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