Bootstrap: fix imports for ipam models

[bile0026]

Fixes: #641

Fix incorrectly nested classes for IPAM models in the bootstrap models.

[jdrew82]

LGTM!

[glennmatthews]

I think the right way to pin the poetry version is something like:

      - name: "Setup environment"
        uses: "networktocode/gh-action-setup-poetry-environment@v6"
        with:
          poetry-version: "1.8.4"

[glennmatthews]

I think the right way to pin the poetry version is something like:

      - name: "Setup environment"
        uses: "networktocode/gh-action-setup-poetry-environment@v6"
        with:
          poetry-version: "1.8.4"

This would be a separate "job"?

I don't think so - think it's just needed in each step that's calling that action.