Bump org.hsqldb:hsqldb from 2.7.2 to 2.7.3

Bumps org.hsqldb:hsqldb from 2.7.2 to 2.7.3.

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

Signed-off-by: dependabot[bot] <support@github.com>

rxjava3-jdbc/pom.xml

@@ -83,7 +83,7 @@
         <dependency>
             <groupId>org.hsqldb</groupId>
             <artifactId>hsqldb</artifactId>
-            <version>2.7.2</version>
+            <version>2.7.3</version>
             <classifier>jdk8</classifier> 
             <scope>test</scope>
         </dependency>