Add AWS Healthomics to the timeline (#202)

Author: mr-c

content/_data/timeline.yml

@@ -37,3 +37,4 @@ timeline_events:
   - year: 2023
     event: |
       <a href="https://cwl.discourse.group/c/cwlcon-2023/13">2023 CWL Conference</a> (Online)<br>
+      <a href="https://aws.amazon.com/about-aws/whats-new/2023/06/amazon-omics-common-workflow-language/">Support for CWL in AWS HealthOmics</a>