Bump System.Text.Json from 8.0.0 to 8.0.4 in /src/OidcClient

Bumps System.Text.Json from 8.0.0 to 8.0.4.

---
updated-dependencies:
- dependency-name: System.Text.Json
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

src/OidcClient/OidcClient.csproj

@@ -51,7 +51,7 @@
 
   <!--Conditional Package references -->
   <ItemGroup Condition="'$(TargetFramework)' != 'net6.0'">
-    <PackageReference Include="System.Text.Json" Version="8.0.0" />
+    <PackageReference Include="System.Text.Json" Version="8.0.4" />
   </ItemGroup>   
 
 </Project>