fix: Use std::shared_ptr<ImageManager> instead of SharedImageManager (#2723)

## Summary

Update types to reflect changes in
facebook/react-native#52888

## Test Plan

Compilation

Author: christophpurrer

common/cpp/react/renderer/components/rnsvg/RNSVGImageComponentDescriptor.h

@@ -37,7 +37,7 @@ class RNSVGImageComponentDescriptor final
   }
 
  private:
-  const SharedImageManager imageManager_;
+  const std::shared_ptr<ImageManager> imageManager_;
 };
 
 } // namespace react

common/cpp/react/renderer/components/rnsvg/RNSVGImageShadowNode.cpp

@@ -18,7 +18,7 @@ namespace react {
 const char RNSVGImageComponentName[] = "RNSVGImage";
 
 void RNSVGImageShadowNode::setImageManager(
-    const SharedImageManager &imageManager) {
+    const std::shared_ptr<ImageManager> &imageManager) {
   ensureUnsealed();
   imageManager_ = imageManager;
 }

common/cpp/react/renderer/components/rnsvg/RNSVGImageShadowNode.h

@@ -41,7 +41,7 @@ class JSI_EXPORT RNSVGImageShadowNode final : public ConcreteViewShadowNode<
   /*
    * Associates a shared `ImageManager` with the node.
    */
-  void setImageManager(const SharedImageManager &imageManager);
+  void setImageManager(const std::shared_ptr<ImageManager> &imageManager);
 
   static RNSVGImageState initialStateData(
       Props::Shared const &props,
@@ -58,7 +58,7 @@ class JSI_EXPORT RNSVGImageShadowNode final : public ConcreteViewShadowNode<
  private:
   ImageSource getImageSource() const;
 
-  SharedImageManager imageManager_;
+  std::shared_ptr<ImageManager> imageManager_;
 
   void updateStateIfNeeded();
 };