upgrade Solr to use Lucene 9.6.0

Apache Lucene 9.6.0 was recently released: https://lists.apache.org/thread/d4zw7o3t0g4h329wk7vc7s5730bsyk5t

This ticket is to upgrade Solr's Lucene dependency from 9.5.0 to the latest 9.6.0 version.

new or existing contributors interested in this ticket:

• please take a look at the documentation to see what's involved: https://github.com/apache/solr/blob/main/dev-docs/lucene-upgrade.md
• optional: add a short note on this ticket to share your intention to work on this
• make the upgrade changes (and of course do feel free to ask any questions that may arise)
• open a pull request

Solr committers, please could you:

• help review/merge/backport etc. the pull request for this ticket
• try and leave the upgrade itself as an opportunity for someone else to also contribute to the project

Thanks everyone!