Update dependency org.testcontainers:testcontainers to v1.21.0

Author: renovate[bot]

pom.xml

@@ -92,7 +92,7 @@
     <dependency>
       <groupId>org.testcontainers</groupId>
       <artifactId>testcontainers</artifactId>
-      <version>1.20.4</version>
+      <version>1.21.0</version>
       <scope>test</scope>
       <exclusions>
         <!-- Provided by jackson2-api plugin -->