Bump aws-java-sdk-bom from 1.11.820 to 1.11.838 (#70)

Bumps [aws-java-sdk-bom](https://github.com/aws/aws-sdk-java) from 1.11.820 to 1.11.838.
- [Release notes](https://github.com/aws/aws-sdk-java/releases)
- [Changelog](https://github.com/aws/aws-sdk-java/blob/master/CHANGELOG.md)
- [Commits](aws/aws-sdk-java@1.11.820...1.11.838)

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Author: dependabot[bot]

pom.xml

@@ -41,7 +41,7 @@
         <spring-data.version>2.3.1.RELEASE</spring-data.version>
 
         <hibernate-validator.version>6.1.5.Final</hibernate-validator.version>
-        <aws-java-sdk.version>1.11.820</aws-java-sdk.version>
+        <aws-java-sdk.version>1.11.838</aws-java-sdk.version>
         <junit.version>4.13</junit.version>
         <mockito.version>2.23.0</mockito.version>
         <cdi.version>2.0</cdi.version>