Bump org.testcontainers:testcontainers from 1.20.5 to 1.20.6 (jenkinsci#1264)

Author: dependabot[bot]

pom.xml

@@ -249,7 +249,7 @@
     <dependency>
       <groupId>org.testcontainers</groupId>
       <artifactId>testcontainers</artifactId>
-      <version>1.20.5</version>
+      <version>1.20.6</version>
       <scope>test</scope>
     </dependency>
   </dependencies>