chore(msk): deprecate kafka version 1.1.1 (#25566)

Closes #25565

As described in the docs, Apache Kafka 1.1.1 is no longer supported (only for existing clusters): [https://docs.aws.amazon.com/msk/latest/developerguide/supported-kafka-versions.html#1.1.1](https://docs.aws.amazon.com/msk/latest/developerguide/supported-kafka-versions.html#1.1.1)

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

@@ -3,7 +3,11 @@
  */
 export class KafkaVersion {
   /**
+   * **Deprecated by Amazon MSK. You can't create a Kafka cluster with a deprecated version.**
+   *
    * Kafka version 1.1.1
+   *
+   * @deprecated use the latest runtime instead
    */
   public static readonly V1_1_1 = KafkaVersion.of('1.1.1');