feat: write poetry command in just file (#7)

# Description

This PR will add a command to the just file to update all dependencies
already written into the lock file.

Closes #6

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This PR needs a quick review.

## Checklist

- [x] Read through for typos, added new words to the dictionary
- [x] Checked that the README is up to date
- [x] Resolved any Ruff errors / formatted in Markdown

---------

Co-authored-by: Luke W. Johnston <lwjohnst86@users.noreply.github.com>

Author: K-Beicher

justfile

@@ -28,3 +28,7 @@ check-commits:
   else
     echo "Not on main or haven't committed yet."
   fi
+
+# Update all dependencies in lockfile
+update-deps:
+  poetry update