Update testcontainers-java monorepo to v1.21.0

Author: renovate[bot]

pom.xml

@@ -80,7 +80,7 @@
     <sonar.host.url>http://localhost:9000</sonar.host.url>
 
     <kotlin.code.style>official</kotlin.code.style>
-    <test.containers.version>1.20.6</test.containers.version>
+    <test.containers.version>1.21.0</test.containers.version>
     <osgi.export>org.mybatis.dynamic.sql.*;version=${project.version};-noimport:=true</osgi.export>
 
     <!-- Reproducible Builds -->