chore(deps-dev): bump hsqldb from 2.2.6 to 2.6.0 (#11737)

Bumps hsqldb from 2.2.6 to 2.6.0.

---
updated-dependencies:
- dependency-name: org.hsqldb:hsqldb
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

flow-server/pom.xml

@@ -162,7 +162,7 @@
         <dependency>
             <groupId>org.hsqldb</groupId>
             <artifactId>hsqldb</artifactId>
-            <version>2.2.6</version>
+            <version>2.6.0</version>
             <scope>test</scope>
         </dependency>