Update dependency org.testcontainers:testcontainers-bom to v1.20.3 (#430)

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

Author: renovate[bot]

pom.xml

@@ -20,7 +20,7 @@
     <java.version>21</java.version>
     <node.version>v18.16.0</node.version>
     <spring-cloud-aws.version>3.1.1</spring-cloud-aws.version>
-    <testcontainers.version>1.20.1</testcontainers.version>
+    <testcontainers.version>1.20.3</testcontainers.version>
     <wiremock.version>3.6.0</wiremock.version>
     <p6spy.version>3.9.1</p6spy.version>
     <mockito.version>5.11.0</mockito.version>