Update dependency org.testcontainers:testcontainers to v1.21.0

Author: renovate[bot]

pom.xml

@@ -11,7 +11,7 @@
     </parent>
 
     <artifactId>xrates</artifactId>
-    <version>0.0.1-SNAPSHOT</version>
+    <version>0.0.2-SNAPSHOT</version>
 
     <properties>
         <server.port>8022</server.port>
@@ -120,7 +120,7 @@
         <dependency>
             <groupId>org.testcontainers</groupId>
             <artifactId>testcontainers</artifactId>
-            <version>1.16.3</version>
+            <version>1.21.0</version>
             <scope>test</scope>
         </dependency>
     </dependencies>