chore: Bump Terminal.Gui from 2.2.2 to 2.4.3 (#148)

Updated [Terminal.Gui](https://github.com/gui-cs/Terminal.Gui) from
2.2.2 to 2.4.3.

Author: dependabot[bot]

src/Imperium.Terminal/Imperium.Terminal.fsproj

@@ -18,7 +18,7 @@
     <Compile Include="Program.fs" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="Terminal.Gui" Version="2.2.2" />
+    <PackageReference Include="Terminal.Gui" Version="2.4.3" />
     <ProjectReference Include="../Imperium/Imperium.fsproj" />
   </ItemGroup>
 </Project>