Bump org.postgresql:postgresql from 42.5.3 to 42.5.4 in /examples

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.5.3 to 42.5.4.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.5.3...REL42.5.4)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

examples/linked-container/build.gradle

@@ -9,7 +9,7 @@ dependencies {
     compileOnly 'org.slf4j:slf4j-api:1.7.36'
     implementation 'com.squareup.okhttp3:okhttp:4.10.0'
     implementation 'org.json:json:20220924'
-    testImplementation 'org.postgresql:postgresql:42.5.3'
+    testImplementation 'org.postgresql:postgresql:42.5.4'
     testImplementation 'ch.qos.logback:logback-classic:1.3.5'
     testImplementation 'org.testcontainers:postgresql'
     testImplementation 'org.assertj:assertj-core:3.24.2'