fix: use tutor utils.execute instead of subprocess call

tutor/commands/config.py

@@ -13,7 +13,7 @@
 from tutor import config as tutor_config
 from tutor import env, exceptions, fmt, hooks
 from tutor import interactive as interactive_config
-from tutor import serialize
+from tutor import serialize, utils
 from tutor.commands.context import Context
 from tutor.commands.params import ConfigLoaderParam
 from tutor.types import Config, ConfigValue
@@ -284,9 +284,9 @@ def edit(context: Context) -> None:
             f"Failed to find utility to launch an editor. Edit {config_file} with the editor of your choice."
         )
 
-    subprocess.call(open_cmd)
+    utils.execute(open_cmd)
     click.echo(
-        "Remember to run 'tutor config save' after editing, to apply the changes to your environment."
+        "Remember to run 'tutor config save' after editing to apply the changes to your environment."
     )