Incorrect version for aws-cryptographic-material-providers in README

[Nairvishwa24998]

Summary

The README for the AWS Encryption SDK Java lists the following dependency:

<dependency>
  <groupId>software.amazon.cryptography</groupId>
  <artifactId>aws-cryptographic-material-providers</artifactId>
  <version>3.0.2</version>
</dependency>

However, version 3.0.2 does not exist on Maven Central.
The latest available version is 1.11.0 as can be seen in the image below

Suggested fix
Update the README to use a valid version:

<version>1.11.0</version>