ci: Update Kubernetes versions to latest three minor releases

[Copilot]

What this PR does / why we need it:

Updates CI test matrix and Makefile to use the latest three Kubernetes minor versions available in KIND (Kubernetes in Docker).

Which issue(s) this PR fixes (optional, using fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when the PR gets merged):
Fixes #

Special notes for your reviewer:

Changes

• Workflow matrices (.github/workflows/workflow.yaml, .github/workflows/test-gator.yaml): Updated from ["1.31.6", "1.32.3", "1.33.2"] to ["1.32.8", "1.33.4", "1.34.0"]
• Makefile: Updated default KUBERNETES_VERSION from 1.33.0 to 1.34.0
• AGENTS.md: Updated version range documentation to reflect 1.32-1.34

This maintains the project's policy of testing against the latest three supported Kubernetes minor versions.

Note on Version Selection

The versions selected (1.32.8, 1.33.4, 1.34.0) represent the latest available KIND node images for each minor version. While newer Kubernetes patch releases exist (1.32.10, 1.33.6, 1.34.2), KIND images are not yet available for those versions. KIND image availability typically lags behind Kubernetes releases, which is why we use the most recent patch version that has a corresponding KIND node image.

Original prompt

update kubernets version to latest three version in workflow files for CI, update kubernets version to latest in Makefile.

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[JaydipGabani]

@copilot can you fix the CI error?

[Copilot]

@copilot can you fix the CI error?

Fixed in c340dd6. The CI error was caused by using Kubernetes versions that don't have corresponding KIND (Kubernetes in Docker) images yet. Updated to use the latest available KIND images for each minor version: 1.32.8, 1.33.4, and 1.34.0.