SolrConfig warning when upgrading XWiki to 16.2.0+ from pre 14.8 versions

Steps to reproduce

1. Create an older instance of XWiki (e.g. what I used for this test is XWiki 12.10.11)
2. Replace the WAR with the one from a newer XWiki version (e.g. 16.20 RC1 or 16.2.0) or the data folder in the newer version (on Jetty/HSQL)
3. Start XWiki to perform the upgrade
4. Observe the logs

Expected results

No (other) warnings are displayed.

Actual results

The following warning is displayed twice:

2024-03-26 15:40:40,073 [main] WARN  o.a.s.c.SolrConfig             - solrconfig.xml: <jmx> is no longer supported, use solr.xml:/metrics/reporter section instead

The issue could not be reproduced when upgrading XWiki 12.10.11 to 16.0.0.

Please find attached the full logs.