Update solr config with Search API Solr 4.3.x configset

[marji]

There has been significant changes between search_api_solr 4.2.x and the current search_api_solr 4.3.x.

There is no easy upgrade path, the solr core needs to be dropped to get rid of the 4.2.x configuration and recreated with the 4.3.x

The solr config .docker/config/solr/ should be upgraded with 4.3.x schema.

Justification

search_api_solr 4.2.x version is not supported. To avoid schema errors, as per the release notes:
https://www.drupal.org/project/search_api_solr/releases/4.3.5 "How to upgrade from 4.2.x or earlier"
or https://www.drupal.org/project/search_api_solr/issues/3390768
the scaffold should use 4.3.x configset.

[marji]

I've created #105 to address this.