Update dependency org.hsqldb:hsqldb to v2.6.0

Author: renovate-bot

gradle.properties

@@ -18,7 +18,7 @@ guavaVersion=30.1.1-jre
 hibernateVersion=5.4.26.Final
 httpclientVersion=3.1
 httpcomponentsVersion=4.5.13
-hsqldbVersion=2.5.0
+hsqldbVersion=2.6.0
 jacksonDatabindVersion=2.12.4
 jacksonVersion=2.12.5
 janinoVersion=3.1.6