LibWeb: Fix a few "missing visit_edges" warnings from the GC verifier

Author: https://github.com/mattco98
Commit: aac873fcec
Pull-request: https://github.com/SerenityOS/serenity/pull/23861
Reviewed-by: https://github.com/awesomekling

Userland/Libraries/LibWeb/SVG/SVGDecodedImageData.cpp

@@ -167,4 +167,11 @@ Optional<CSSPixelFraction> SVGDecodedImageData::intrinsic_aspect_ratio() const
     return {};
 }
 
+void SVGDecodedImageData::SVGPageClient::visit_edges(Visitor& visitor)
+{
+    Base::visit_edges(visitor);
+    visitor.visit(m_host_page);
+    visitor.visit(m_svg_page);
+}
+
 }