Upgrading elastisearch.py lib in docker image

[PascalLike]

Overview

Upgrading elasticsearch.py library installed in Docker image of the Elasticsearch example to 8.4.0.

Related Issue / Discussion

#1161

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

[doublebyte1]

It looks good