GROOVY-11765: Bump spotbugs to 4.9.6

Author: paulk-asert

versions.properties

@@ -53,7 +53,7 @@ qdox=2.2.0
 slf4j=2.0.17
 # running with Groovy 5 can be allowed with -Dspock.iKnowWhatImDoing.disableGroovyVersionCheck=true
 spock=2.3-groovy-4.0
-spotbugs=4.9.4
+spotbugs=4.9.6
 treelayout=1.0.3
 xmlunit=1.6
 xstream=1.4.21