use pip since global devenv might be too old for update cmd

devenv/sync.py

@@ -86,7 +86,7 @@ def check_minimum_version(minimum_version: str):
 
 Please run the following to update your global devenv to the minimum:
 
-{constants.root}/bin/devenv update {minimum_version}
+{constants.root}/venv/bin/pip install -U 'sentry-devenv=={minimum_version}'
 
 Then, use it to run sync this one time.