Update super_editor hash (#349)

Roll super editor tests to a commit with the fix related to flutter/flutter#143847

Author: bleroux

registry/super_editor.test

@@ -15,7 +15,7 @@ update=super_editor/
 
 # Fetch the super_editor mono repo.
 fetch=git clone https://github.com/superlistapp/super_editor.git tests
-fetch=git -C tests checkout dc7013f2f9be145d655e891eb2502baf2d6795a1
+fetch=git -C tests checkout 93bffe8080df0d447dac8a5bc72406611c3586f4
 
 # Run the tests.
 test.posix=./flutter_test_registry/flutter_test_repo_test.sh