Update to org.hsqldb:hsqldb:2.6.1

Closes gh-843

dependencies/spring-authorization-server-dependencies.gradle

@@ -19,6 +19,6 @@ dependencies {
 		api "com.squareup.okhttp3:mockwebserver:4.10.0"
 		api "com.squareup.okhttp3:okhttp:4.10.0"
 		api "com.jayway.jsonpath:json-path:2.7.0"
-		api "org.hsqldb:hsqldb:2.5.2"
+		api "org.hsqldb:hsqldb:2.6.1"
 	}
 }