Upgrade test-containers to 1.21.4 (helidon-io#11164)

Author: barchetta

dependencies/pom.xml

@@ -162,7 +162,7 @@
         <version.lib.slf4j>2.0.17</version.lib.slf4j>
         <version.lib.smallrye-openapi>3.3.4</version.lib.smallrye-openapi>
         <version.lib.snakeyaml>2.5</version.lib.snakeyaml>
-        <version.lib.testcontainers>1.19.8</version.lib.testcontainers>
+        <version.lib.testcontainers>1.21.4</version.lib.testcontainers>
         <version.lib.typesafe-config>1.4.4</version.lib.typesafe-config>
         <version.lib.tyrus>2.1.5</version.lib.tyrus>
         <version.lib.weld-api>5.0.SP3</version.lib.weld-api>