Update dependency org.testcontainers:testcontainers to v1.21.4 (#458)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

pom.xml

@@ -138,7 +138,7 @@
         <dependency>
             <groupId>org.testcontainers</groupId>
             <artifactId>testcontainers</artifactId>
-            <version>1.21.3</version>
+            <version>1.21.4</version>
             <scope>test</scope>
         </dependency>
         <dependency>