Unreviewed, fix !ENABLE(ACCESSIBILITY) build following 262566@main

https://bugs.webkit.org/show_bug.cgi?id=254977

Unreviewed PlayStation build fix.

* Source/WebCore/accessibility/AXObjectCache.h:
(WebCore::AXObjectCache::updateRelations):
Add missing function definition.

Canonical link: https://commits.webkit.org/262570@main

Source/WebCore/accessibility/AXObjectCache.h

@@ -722,6 +722,7 @@ inline void AXObjectCache::onRendererCreated(Element&) { }
 inline void AXObjectCache::updateLoadingProgress(double) { }
 inline SimpleRange AXObjectCache::rangeForNodeContents(Node& node) { return makeRangeSelectingNodeContents(node); }
 inline std::optional<Vector<AXID>> AXObjectCache::relatedObjectIDsFor(const AXCoreObject&, AXRelationType) { return std::nullopt; }
+inline void AXObjectCache::updateRelations(Element&, const QualifiedName&) { }
 inline void AXObjectCache::remove(AXID) { }
 inline void AXObjectCache::remove(RenderObject*) { }
 inline void AXObjectCache::remove(Node&) { }