Update default cluster version to Kubernetes v1.34

[naclonts]

Description

Update default cluster version to Kubernetes v1.34, which is the current EKS default in the DescribeClusterVersions API.

Checklist

• Added tests that cover your change (if possible)
• Added/modified documentation as required (such as the README.md, or the userdocs directory)
• Manually tested
• Made sure the title of the PR is a good description that can go into the release notes
• (Core team) Added labels for change area (e.g. area/nodegroup) and kind (e.g. kind/improvement)

BONUS POINTS checklist: complete for good vibes and maybe prizes?! 🤯

• Backfilled missing tests for code in same general area 🎉
• Refactored something and made the world a better place 🌟

[torredil]

Will also need to bump up cluster version here:

eksctl/pkg/ctl/cmdutils/filter/nodegroup_filter_test.go

Line 351 in 4ca1fa2

"version": "1.32"

to fix unit test:

Summarizing 1 Failure:
  [FAIL] nodegroup filter ForEach [It] should iterate over unique nodegroups, apply defaults and validate

[NicholasBlaskey]

cool with doing this change

long term we should replace this with the api response, not sure how much effort that is

[naclonts]

Will also need to bump up cluster version here:

Thanks for the tip - updated that test to use the api.DefaultVersion const as well.