Pin pyxform version with support for background-geopoint questions

[RuthShryock]

Checklist

1. If you've added code that should be tested, add tests
2. If you've changed APIs, update (or create!) the documentation
3. Ensure the tests pass
4. Run ./python-format.sh to make sure that your code lints and that you've followed our coding style
5. Write a title and, if necessary, a description of your work suitable for publishing in our release notes
6. Mention any related issues in this repository (as #ISSUE) and in other repositories (as kobotoolbox/other#ISSUE)
7. Open an issue in the docs if there are UI/UX changes
8. Create a testing plan for the reviewer and add it to the Testing section

Description

Support forms withbackground-geopointquestions which save background GPS location in surveys.

Notes

⚠️ This should NOT be reviewed until #5126 is merged.

Kpi is updated to support version 2.1.1 of pyxform. This version does not include recent support for background-geopoint questions so we are backporting this work into 2.1.1.

Also note that this pr has a small fix for a missing notify import in the formbuilder.

Testing

1. Reinstall dev_requirements.txt in your shell.
2. Upload an XLS form with a background-geopoint question. (Simple_background_geo.xlsx)
3. Create and deploy the project.
4. Download the XML and verify it has translated the form correctly. See example here.

[notion-workspace]

Pin pyxform version with backported support for background-geopointquestions

[jnm]

After looking at this and the changes in pyxform v2.2.0, let's upgrade directly to that release. It'll make our lives easier in the future