feat(msk): add Kafka versions 2.6.3, 2.7.1 and 2.7.2 (aws#18191)

Add support for Apache Kafka versions 2.6.3, 2.7.1 and 2.7.2 in Amazon MSK.

Announcements:
- [2.6.3](https://aws.amazon.com/about-aws/whats-new/2021/12/amazon-msk-apache-support-kafka-2-6-3/) (Posted On: Dec 21, 2021)
- [2.7.1](https://aws.amazon.com/about-aws/whats-new/2021/05/amazon-msk-adds-support-for-apache-kafka-version-2-7-1/) (Posted On: May 25, 2021)
- [2.7.2](https://aws.amazon.com/about-aws/whats-new/2021/12/amazon-msk-support-apache-kafka-version-2-7-2/) (Posted On: Dec 21, 2021)

----

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

packages/@aws-cdk/aws-msk/lib/cluster-version.ts

@@ -42,11 +42,26 @@ export class KafkaVersion {
    */
   public static readonly V2_6_2 = KafkaVersion.of('2.6.2');
 
+  /**
+   * Kafka version 2.6.3
+   */
+  public static readonly V2_6_3 = KafkaVersion.of('2.6.3');
+
   /**
    * Kafka version 2.7.0
    */
   public static readonly V2_7_0 = KafkaVersion.of('2.7.0');
 
+  /**
+   * Kafka version 2.7.1
+   */
+  public static readonly V2_7_1 = KafkaVersion.of('2.7.1');
+
+  /**
+   * Kafka version 2.7.2
+   */
+  public static readonly V2_7_2 = KafkaVersion.of('2.7.2');
+
   /**
    * Kafka version 2.8.0
    */