fix: services-custom/dynamodb-enhanced/pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-IONETTY-5725787

Author: snyk-bot

services-custom/dynamodb-enhanced/pom.xml

@@ -36,7 +36,7 @@
     </repositories>
 
     <properties>
-        <awsjavasdk.version>2.19.0</awsjavasdk.version>
+        <awsjavasdk.version>2.20.69</awsjavasdk.version>
         <jre.version>1.8</jre.version>
     </properties>