Fix error for CSV/GeoJSON provider when the bbox parameter has 6 coordinates

[francbartoli]

Overview

Related Issue / discussion

Closes #2186

Additional information

Dependency policy (RFC2)

• I have ensured that this PR meets RFC2 requirements

Updates to public demo

• I have ensured that breaking changes to the pygeoapi master demo server have been addressed
  • https://github.com/geopython/demo.pygeoapi.io/blob/master/services/pygeoapi_master/local.config.yml

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• I'd like to contribute [feature X|bugfix Y|docs|something else] to pygeoapi. I confirm that my contributions to pygeoapi will be compatible with the pygeoapi license guidelines at the time of contribution
• I have already previously agreed to the pygeoapi Contributions and Licensing Guidelines

[francbartoli]

@tomkralidis looking at the code more deeply this exception is returned by the box method from shapely.geometry. Beyond the points already fixed that function is used only in the util.py function bbox2geojsongeometry which is being used just by the CSWFacadeProvider class. I'm going to add only a test to this additional use case which already doesn't give error.