Bump MessagePack from 1.7.3.4 to 1.9.3 in /ZipStudio (#3)

Bumps [MessagePack](https://github.com/neuecc/MessagePack-CSharp) from 1.7.3.4 to 1.9.3.
- [Release notes](https://github.com/neuecc/MessagePack-CSharp/releases)
- [Commits](MessagePack-CSharp/MessagePack-CSharp@v1.7.3.4...v1.9.3)

Signed-off-by: dependabot[bot] <support@github.com>

ZipStudio/packages.config

@@ -3,7 +3,7 @@
   <package id="Costura.Fody" version="3.2.0" targetFramework="net471" />
   <package id="DotNetZip" version="1.12.0" targetFramework="net471" />
   <package id="Fody" version="3.3.2" targetFramework="net471" developmentDependency="true" />
-  <package id="MessagePack" version="1.7.3.4" targetFramework="net471" />
+  <package id="MessagePack" version="1.9.3" targetFramework="net471" />
   <package id="Microsoft-WindowsAPICodePack-Core" version="1.1.3.3" targetFramework="net471" />
   <package id="Microsoft-WindowsAPICodePack-Shell" version="1.1.3.3" targetFramework="net471" />
   <package id="NUniversalCharDet" version="1.0.0" targetFramework="net462" />