Update Terminal.Gui requirement from 1.0.0-pre.* to 1.0.0.* (#1270)

Updates the requirements on [Terminal.Gui](https://github.com/migueldeicaza/gui.cs) to permit the latest version.
- [Release notes](https://github.com/migueldeicaza/gui.cs/releases)
- [Commits](https://github.com/migueldeicaza/gui.cs/compare/v1.0.0-pre.1...v1.0.0)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

ReactiveExample/ReactiveExample.csproj

@@ -6,7 +6,7 @@
     <ItemGroup>
         <PackageReference Include="Pharmacist.MsBuild" Version="2.0.8" PrivateAssets="all" />
         <PackageReference Include="Pharmacist.Common" Version="2.0.8" />
-        <PackageReference Include="Terminal.Gui" Version="1.0.0-pre.*" />
+        <PackageReference Include="Terminal.Gui" Version="1.0.0.*" />
         <PackageReference Include="ReactiveUI.Fody" Version="13.2.18" />
         <PackageReference Include="ReactiveUI" Version="13.2.18" />
     </ItemGroup>