Merge branch 'update-eks-version-documentation' into 'master'

Update GitLab User Doc for EKS supported version

See merge request gitlab-org/gitlab!69387

doc/user/project/clusters/index.md

@@ -47,8 +47,6 @@ Kubernetes version to any supported version at any time:
 - 1.19 (support ends on February 22, 2022)
 - 1.18 (support ends on November 22, 2021)
 - 1.17 (support ends on September 22, 2021)
-- 1.16 (support ends on July 22, 2021)
-- 1.15 (support ends on May 22, 2021)
 
 Some GitLab features may support versions outside the range provided here.
 

vendor/aws/cloudformation/eks_cluster.yaml

@@ -21,7 +21,7 @@ Parameters:
 
   NodeImageIdSSMParam:
     Type: "AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>"
-    Default: /aws/service/eks/optimized-ami/1.15/amazon-linux-2/recommended/image_id
+    Default: /aws/service/eks/optimized-ami/1.17/amazon-linux-2/recommended/image_id
     Description: AWS Systems Manager Parameter Store parameter of the AMI ID for the worker node instances.
 
   NodeInstanceType: