chore(deps): bump org.testcontainers:postgresql

Bumps [org.testcontainers:postgresql](https://github.com/testcontainers/testcontainers-java) from 1.19.5 to 1.19.6.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.19.5...1.19.6)

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

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

run/springboot-cloudsql/build.gradle.kts

@@ -26,7 +26,7 @@ dependencies {
 
     testImplementation("org.springframework.boot:spring-boot-starter-test")
 
-    testImplementation("org.testcontainers:postgresql:1.19.5")
+    testImplementation("org.testcontainers:postgresql:1.19.6")
     testImplementation("org.testcontainers:r2dbc:1.19.6")
 
     developmentOnly("org.springframework.boot:spring-boot-devtools")