Override postgresql version defined by spring-boot-dependencies

[bennavapbc]

🎫 Ticket

https://jira.cms.gov/browse/AB2D-6397

🛠 Changes

• In the parent POM, rename property from postgres.version to postgresql.version to properly override version defined in spring-boot-dependencies.
• Bump postgresql version to 42.7.4 to be consistent with [Snyk] Upgrade org.postgresql:postgresql from 42.7.3 to 42.7.4 #1412

ℹ️ Context

The postgres version defined by spring-boot-dependencies is 42.3.8. Snyk flags this version as vulnerable.

Modules common and job override this version to 42.7.3. However, when another module imports one of these modules, Maven does not select this overridden version and instead selects the version defined by spring-boot-dependencies.

🧪 Validation

Running mvn dependency:tree on main shows different versions being used for different modules.
On the feature branch, the same version is used across all modules.