Bump Helm support to 3.21.0 and 4.2.0 (#2588)
* chore: bump pinned helm versions
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* fix: align kubernetes module pins for helm bump
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* docs: clarify helm and k8s version pins
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* test: update helm 4 snapshot outputs
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* test: update helm 4 postrender integration fixture
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* test: update helm 4 postrender template fixture
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Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: yxxhero <11087727+yxxhero@users.noreply.github.com>
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