chore(deps): update dependency helm-unittest/helm-unittest to v1.2.1

[renovate]

This PR contains the following updates:

Package	Update	Change
helm-unittest/helm-unittest	minor	v1.1.2 → v1.2.1

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Release Notes

helm-unittest/helm-unittest (helm-unittest/helm-unittest)

v1.2.1

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Improvements

• Improve installation script to support Helm 4.3.0 and above with OCI plugin installation
• Improve installation script to prefer sha256sum over shasum when both available (credits @​dmitri-d)

Fixes

• Fix test-output action to always upload test results on all environments even when the test fails

Updates

• Update base images to latest versions
• Update documentation (credits @​josef-hak)

v1.2.0

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Features

• Add opt-in parallel execution of test suites (credits @​michal-marszalek-h2oai)
• Full helm 4 support (resolves #​777, credits @​Szpadel)

Fixes

• Fix arm64 docker images (resolves #​769, resolves #​917)

Updates

• Update packages to latest versions
• Update pipeline actions to latest versions
• Update base images to latest versions
• Update documentation

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