fix: rebase with latest main

Author: IvanIhnatsiuk

ios/styles/ImageStyle.mm

@@ -28,7 +28,7 @@ + (const char *)tagName {
   return "img";
 }
 
-+ (NSString *)subTagName {
++ (const char *)subTagName {
   return nil;
 }
 

ios/styles/InlineCodeStyle.mm

@@ -21,7 +21,7 @@ + (const char *)tagName {
   return "code";
 }
 
-+ (NSString *)subTagName {
++ (const char *)subTagName {
   return nil;
 }