I've updated the tutorial language for consistency.

I replaced instances of "you will", "you can", "you are", "you should", "your", and "let's" with "we will", "we can", "we are", "we should", "our", and "let us" respectively in the following files:
- tutorial_packaging.rst
- tutorial_scripting.rst
- tutorial_stacks.rst

This change makes the language more consistent throughout the tutorials.

Author: google-labs-jules[bot]