deps(core): update dependency messagepack to 3.1.9

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
MessagePack	3.1.8 → 3.1.9

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Release Notes

MessagePack-CSharp/MessagePack-CSharp (MessagePack)

v3.1.9

What's Changed

Security fix

• Fix Nested arrays can blow past buffer length limits via 7fd78bb

Other fixes

• Update DynamicAssembly usage to honor different AssemblyLoadContext's by @​BertanAygun in #​2183
• Update v2.x to build again by @​AArnott in #​2264
• Add more types to the default disallow list of named types to be deserialized by @​AArnott in #​2263
• Add several known unsafe 'gadgets' to the disallow list by @​AArnott in #​2269
• Revise end-of-life date for version 2.x by @​AArnott in #​2282
• Fix OldSpec byte[] encoding emitting unsupported str8 headers by @​AArnott with @​Copilot in #​2287
• v2 to master by @​AArnott in #​2295
• Fix build warning and Windows build break by @​AArnott in #​2300
• Fix source generator snapshot ordering by @​AArnott in #​2303
• Test before versioned release build by @​AArnott in #​2304

Full Changelog: MessagePack-CSharp/MessagePack-CSharp@v3.1.8...v3.1.9

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