Bump org.testcontainers:testcontainers in /testing/testcontainers/java

Bumps [org.testcontainers:testcontainers](https://github.com/testcontainers/testcontainers-java) from 1.20.2 to 1.20.3.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.20.2...1.20.3)

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

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

testing/testcontainers/java/build.gradle

@@ -26,9 +26,9 @@ dependencies {
     implementation 'org.slf4j:slf4j-simple:2.0.16'
     testImplementation 'junit:junit:4.13.2'
     testImplementation "org.assertj:assertj-core:3.26.3"
-    testImplementation 'org.testcontainers:testcontainers:1.20.2'
-    testImplementation 'org.testcontainers:cratedb:1.20.2'
-    testImplementation 'org.testcontainers:postgresql:1.20.2'
+    testImplementation 'org.testcontainers:testcontainers:1.20.3'
+    testImplementation 'org.testcontainers:cratedb:1.20.3'
+    testImplementation 'org.testcontainers:postgresql:1.20.3'
 }
 
 java {