revert slf4j until there's a compatible log4j2 bridge.
<scm.version>1.13.0</scm.version>
<sis.version>1.2</sis.version>
<!-- we'll need to stay on 1.7 until we're java modularized ? -->
- <slf4j.version>2.0.0</slf4j.version>
+ <slf4j.version>1.7.36</slf4j.version>
<solrj.version>8.11.2</solrj.version>
<spring.version>5.3.22</spring.version>
<sqlite.version>3.39.2.1</sqlite.version>
