Bump System.Text.Json from 4.6.0 to 8.0.4 in /src/VendorMediaTypes

Bumps System.Text.Json from 4.6.0 to 8.0.4.

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

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

src/VendorMediaTypes/VendorMediaTypes.csproj

@@ -32,7 +32,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Core" Version="2.2.5" />
-    <PackageReference Include="System.Text.Json" Version="4.6.0" />
+    <PackageReference Include="System.Text.Json" Version="8.0.4" />
   </ItemGroup>
 
 </Project>