Bump the tests group with 1 update

Bumps System.Text.Encoding.CodePages from 10.0.0 to 10.0.9

---
updated-dependencies:
- dependency-name: System.Text.Encoding.CodePages
  dependency-version: 10.0.9
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: tests
...

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Author: dependabot[bot]

src/iTextSharp.LGPLv2.Core/iTextSharp.LGPLv2.Core.csproj

@@ -87,7 +87,7 @@
     </ItemGroup>
 
     <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
-        <PackageReference Include="System.Text.Encoding.CodePages" Version="10.0.0"/>
+        <PackageReference Include="System.Text.Encoding.CodePages" Version="10.0.9"/>
     </ItemGroup>
     <PropertyGroup Condition="'$(TargetFramework)' == 'netstandard2.0'">
         <DefineConstants>NETSTANDARD2_0</DefineConstants>