Update dependency System.Text.Encoding.CodePages to v9

Author: renovate[bot]

SIL.NuGetCleaner/SIL.NuGetCleaner.csproj

@@ -34,7 +34,7 @@ See full changelog at https://github.com/sillsdev/SIL.NuGetCleaner/blob/master/C
     <PackageReference Include="System.Globalization.Extensions" Version="4.3.0" />
     <PackageReference Include="System.Net.Http" Version="4.3.4" />
     <PackageReference Include="System.Security.Principal.Windows" Version="5.0.0" />
-    <PackageReference Include="System.Text.Encoding.CodePages" Version="8.0.0" />
+    <PackageReference Include="System.Text.Encoding.CodePages" Version="9.0.5" />
   </ItemGroup>
 
 </Project>