Upgrading version to 2.0.4 for release. (#315)

*Issue #, if available:*

*Description of changes:*
Bumped version to 2.0.4 for release

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

---------

Co-authored-by: Vedant Jaiswal <vedjasy@amazon.com>

Author: vedant-jaiswal

pom.xml

@@ -16,7 +16,7 @@
   <artifactId>aws-secretsmanager-jdbc</artifactId>
   <packaging>jar</packaging>
   <name>AWS Secrets Manager SQL Connection Library</name>
-  <version>2.0.3</version>
+  <version>2.0.4</version>
   <description>The AWS Secrets Manager SQL Connection Library for Java enables Java developers to easily
     connect to SQL databases using secrets stored in AWS Secrets Manager.
   </description>