Bump com.amazonaws:aws-lambda-java-core in /labs/unicorn-stock-broker

Bumps [com.amazonaws:aws-lambda-java-core](https://github.com/aws/aws-lambda-java-libs) from 1.2.3 to 1.4.0.
- [Commits](https://github.com/aws/aws-lambda-java-libs/commits)

---
updated-dependencies:
- dependency-name: com.amazonaws:aws-lambda-java-core
  dependency-version: 1.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

labs/unicorn-stock-broker/pom.xml

@@ -78,7 +78,7 @@
         <dependency>
             <groupId>com.amazonaws</groupId>
             <artifactId>aws-lambda-java-core</artifactId>
-            <version>1.2.3</version>
+            <version>1.4.0</version>
         </dependency>
         <dependency>
             <groupId>org.crac</groupId>