update Elasticsearch and MongoDB in CI to match pygeoapi-examples

[tomkralidis]

Overview

Bumps Elasticsearch and MongoDB versions in CI to match official examples in pygeoapi-examples.

Related Issue / discussion

geopython/pygeoapi-examples#22

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

Contributions and licensing

(as per https://github.com/geopython/pygeoapi/blob/master/CONTRIBUTING.md#contributions-and-licensing)

• 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

[webb-ben]

+1

Might be worth eventually implementing tests with https://testcontainers.com wherever possible to run these tests without needing to spawn the corresponding database outside of the test context.