chore(deps): update dependency djangorestframework-gis to v1.1

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
djangorestframework-gis	==1.0 -> ==1.1

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Release Notes

openwisp/django-rest-framework-gis (djangorestframework-gis)

v1.1

Compare Source

Features

- Allowed ``GeoFeatureModelSerializer`` to support models without geometry
  field.

Changes
~~~~~~~

**Dependencies:**

- Bumped ``django-filters~=23.5``.
- Added Django ``4.2``, ``5.0``, ``5.1`` to automated testing build.
- Dropped several EOL dependencies from automated testing build:

  - Python ``3.6`` and ``3.7``.
  - Django ``2.2``, ``3.0``, ``3.1`` and ``4.0``.
  - ``djangorestframework < 3.12``.

  The library may continue working with the dependencies listed above, but
  it's not guaranteed.

  Upgrading to more recent dependencies is **highly recommended**.

Bugfixes

• Fixed schema generation for DistanceToPointOrderingFilter.

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