build: Update GutenbergKit version

Author: dcalhoun

Modules/Package.swift

@@ -52,7 +52,7 @@ let package = Package(
         .package(url: "https://github.com/zendesk/support_sdk_ios", from: "8.0.3"),
         // We can't use wordpress-rs branches nor commits here. Only tags work.
         .package(url: "https://github.com/Automattic/wordpress-rs", revision: "alpha-20250505"),
-        .package(url: "https://github.com/wordpress-mobile/GutenbergKit", revision: "1b3e577680ac3086094fa60d5f6b9359e16e3136"),
+        .package(url: "https://github.com/wordpress-mobile/GutenbergKit", revision: "48fd3e7c78ae01aff03403df804d65a7fcaaf581"),
         .package(url: "https://github.com/Automattic/color-studio", branch: "trunk"),
         .package(url: "https://github.com/wordpress-mobile/AztecEditor-iOS", from: "1.20.0"),
     ],