Bump org.testcontainers:testcontainers from 1.21.2 to 1.21.3 (jenkinsci#1305)

Author: dependabot[bot]

pom.xml

@@ -250,7 +250,7 @@
     <dependency>
       <groupId>org.testcontainers</groupId>
       <artifactId>testcontainers</artifactId>
-      <version>1.21.2</version>
+      <version>1.21.3</version>
       <scope>test</scope>
     </dependency>
   </dependencies>