build(deps): Bump System.Text.Json in /src/OrasProject.Oras

Bumps System.Text.Json from 8.0.3 to 8.0.4.

---
updated-dependencies:
- dependency-name: System.Text.Json
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

src/OrasProject.Oras/OrasProject.Oras.csproj

@@ -23,7 +23,7 @@
 		</AssemblyAttribute>
 	</ItemGroup>
 	<ItemGroup>
-		<PackageReference Include="System.Text.Json" Version="8.0.3" />
+		<PackageReference Include="System.Text.Json" Version="8.0.4" />
 	</ItemGroup>
 	<ItemGroup>
 		<None Include="README.md" Pack="true" PackagePath="/" />