chore(deps): bump org.postgresql:postgresql from 42.7.1 to 42.7.3 (#413)

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.7.1 to 42.7.3.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.7.1...REL42.7.3)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

build.gradle

@@ -61,7 +61,7 @@ dependencies {
     implementation 'ch.qos.logback:logback-core:1.5.6' // Logback
 
     // DB
-    implementation 'org.postgresql:postgresql:42.7.1' // PostgreSQL JDBC Driver
+    implementation 'org.postgresql:postgresql:42.7.3' // PostgreSQL JDBC Driver
     implementation 'org.springframework.boot:spring-boot-starter-data-redis' // Redis
     implementation 'org.springframework.boot:spring-boot-starter-data-jpa' // Spring Data JPA
     implementation 'org.springframework.boot:spring-boot-starter-validation' // Hibernate Validator