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deps: Bump MessagePack from 3.1.8 to 3.1.9 #1107

Job	Run time
Build and Test (macos-latest)	3m 15s
Build and Test (ubuntu-latest)	2m 46s
Build and Test (windows-latest)	5m 38s
Pack NuGet Packages	0s
Publish to NuGet.org	0s
	11m 39s