chore(deps-dev): bump org.flywaydb:flyway-database-postgresql (#704)

Bumps org.flywaydb:flyway-database-postgresql from 11.14.1 to 11.15.0.

---
updated-dependencies:
- dependency-name: org.flywaydb:flyway-database-postgresql
  dependency-version: 11.15.0
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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tzatziki-spring-jpa/pom.xml

@@ -81,7 +81,7 @@
         <dependency>
             <groupId>org.flywaydb</groupId>
             <artifactId>flyway-database-postgresql</artifactId>
-            <version>11.14.1</version>
+            <version>11.15.0</version>
             <scope>test</scope>
         </dependency>
         <dependency>