Bump org.testcontainers:postgresql in /sample-apps/jdbc-app

Bumps [org.testcontainers:postgresql](https://github.com/testcontainers/testcontainers-java) from 1.15.0 to 1.19.3.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.15.0...1.19.3)

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

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

sample-apps/jdbc-app/build.gradle

@@ -10,7 +10,7 @@ dependencies {
   api 'javax:javaee-api:8.0.1'
   api 'org.eclipse.microprofile:microprofile:2.1'
 
-  testImplementation 'org.testcontainers:postgresql:1.15.0'
+  testImplementation 'org.testcontainers:postgresql:1.19.3'
   testImplementation 'org.slf4j:slf4j-log4j12:2.0.9'
   testImplementation 'org.junit.jupiter:junit-jupiter:5.10.1'