Update dependency org.testcontainers:testcontainers-bom to v1.20.6

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>3.3.0</spring-cloud-aws.version>
-    <testcontainers.version>1.20.4</testcontainers.version>
+    <testcontainers.version>1.20.6</testcontainers.version>
     <wiremock.version>3.11.0</wiremock.version>
     <p6spy.version>3.9.1</p6spy.version>
     <mockito.version>5.11.0</mockito.version>