Excavator: Upgrade dependencies (#1524)

Author: svc-excavator-bot

versions.props

@@ -7,7 +7,7 @@ com.google.errorprone:error_prone_annotations = 2.11.0
 com.google.guava:guava = 33.5.0-jre
 com.google.guava:guava-testlib = 27.0.1-jre
 com.google.testing.compile:compile-testing = 0.23.0
-com.palantir.sls.versions:sls-versions = 1.8.0
+com.palantir.sls.versions:sls-versions = 1.9.0
 com.netflix.nebula:nebula-test = 10.0.0
 junit:junit = 4.13.2
 org.assertj:assertj-core = 3.27.6