fix(terraform): update CKV_AWS_339 valid EKS versions (#5652)

* Update EKSPlatformVersion.py

EKS 1.23 ended support on 11 Oct 2023. 
Include 1.28 as valid version.

* fix(terraform): update CKV_AWS_339 valid EKS versions

EKS 1.23 extended support works as 11 Oct 2024.
Include 1.28 as valid version.

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fix(terraform): update CKV_AWS_339 valid EKS versions

Description

The change in valid versions, as now 1.24 is the lowest supported version and 1.28 the newest available.
Fix

Update EKS version to a valid version
Checklist:

My code follows the style guidelines of this project
I have performed a self-review of my own code
I have commented my code, particularly in hard-to-understand areas
I have made corresponding changes to the documentation
I have added tests that prove my feature, policy, or fix is effective and works
New and existing tests pass locally with my changes
Any dependent changes have been merged and published in downstream modules

* add missing space

---------

Co-authored-by: Anton Grübel <[email protected]>

checkov/terraform/checks/resource/aws/EKSPlatformVersion.py

@@ -24,7 +24,7 @@ def get_inspected_key(self) -> str:
         return "version"
 
     def get_expected_values(self) -> list[Any]:
-        return ["1.23", "1.24", "1.25", "1.26", "1.27"]
+        return ["1.23", "1.24", "1.25", "1.26", "1.27", "1.28"]
 
 
 check = EKSPlatformVersion()