Update dependency org.testcontainers:postgresql to v1.21.3 (#646)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

build.gradle

@@ -329,7 +329,7 @@ dependencies {
 
   testImplementation group: 'org.apache.camel', name: 'camel-test-spring-junit5', version: versions.camel
   testImplementation group: 'org.apache.camel', name: 'camel-test-junit5', version: versions.camel
-  testImplementation group: 'org.testcontainers', name: 'postgresql', version: '1.21.1'
+  testImplementation group: 'org.testcontainers', name: 'postgresql', version: '1.21.3'
   testImplementation group: 'org.springframework.batch', name: 'spring-batch-test'
   testImplementation group: 'org.javatuples', name: 'javatuples', version: '1.2'