Bump com.amazonaws:aws-lambda-java-log4j2 from 1.6.3 to 1.6.4 (#711)

Bumps [com.amazonaws:aws-lambda-java-log4j2](https://github.com/aws/aws-lambda-java-libs) from 1.6.3 to 1.6.4.
- [Commits](https://github.com/aws/aws-lambda-java-libs/commits)

---
updated-dependencies:
- dependency-name: com.amazonaws:aws-lambda-java-log4j2
  dependency-version: 1.6.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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pom.xml

@@ -69,7 +69,7 @@
         <dependency>
             <groupId>com.amazonaws</groupId>
             <artifactId>aws-lambda-java-log4j2</artifactId>
-            <version>1.6.3</version>
+            <version>1.6.4</version>
         </dependency>