Bump MemoryPack from 1.10.0 to 1.21.0 (#2641)

Author: dependabot[bot]

Flow.Launcher.Infrastructure/Flow.Launcher.Infrastructure.csproj

@@ -54,7 +54,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="MemoryPack" Version="1.10.0" />
+    <PackageReference Include="MemoryPack" Version="1.21.0" />
     <PackageReference Include="Microsoft.VisualStudio.Threading" Version="17.7.30" />
     <PackageReference Include="NLog" Version="4.7.10" />
     <PackageReference Include="NLog.Schema" Version="4.7.10" />