Update more dependencies and fix notifications-utils

This changeset updates a few more dependencies and addresses the challenges we have had in keeping the notifications-utils dependency up-to-date.  The changes include instructions on what to do going forward for future notifications-utils updates.

Signed-off-by: Carlo Costino <carlo.costino@gsa.gov>

README.md

@@ -102,6 +102,23 @@ In either situation, once you are finished and have verified the dependency
 changes are working, please be sure to commit both the `pyproject.toml` and
 `poetry.lock` files.
 
+### Keeping the notification-utils dependency up-to-date
+
+The `notifications-utils` dependency references the other repository we have at
+https://github.com/GSA/notifications-utils - this dependency requires a bit of
+extra legwork to ensure it stays up-to-date.
+
+Whenever a PR is merged in the `notifications-utils` repository, we need to make
+sure the changes are pulled in here and committed to this repository as well.
+You can do this by going through these steps:
+
+- Make sure your local `main` branch is up-to-date
+- Create a new branch to work in
+- Run `make update-utils`
+- Commit the updated `poetry.lock` file and push the changes
+- Make a new PR with the change
+- Have the PR get reviewed and merged
+
 ## To test the application
 
 From a terminal within the running devcontainer: