Update dependency org.testcontainers:testcontainers to v1.21.4

Author: renovate[bot]

pom.xml

@@ -72,7 +72,7 @@
     <dependency>
       <groupId>org.testcontainers</groupId>
       <artifactId>testcontainers</artifactId>
-      <version>1.21.3</version>
+      <version>1.21.4</version>
       <scope>test</scope>
       <exclusions>
         <!-- Provided by jackson2-api plugin -->