[deps]: Update System.Text.Json to v9

Author: renovate[bot]

languages/csharp/Bitwarden.Sdk/Bitwarden.Sdk.csproj

@@ -25,7 +25,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.Text.Json" Version="8.0.5" />
+    <PackageReference Include="System.Text.Json" Version="9.0.4" />
     <None Include="bitwarden.png" Pack="true" PackagePath="\" />
     <None Include="../README.md" Pack="true" PackagePath="\" />
     <None Include="../LICENSE.txt" Pack="true" PackagePath="\" />