Update helm/chart-testing-action action to v2.8.0

[small-hack-renovate]

This PR contains the following updates:

Package	Type	Update	Change
helm/chart-testing-action	action	minor	v2.7.0 -> v2.8.0

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Release Notes

helm/chart-testing-action (helm/chart-testing-action)

v2.8.0

Compare Source

What's Changed

• Bump the actions group across 1 directory with 4 updates by @​dependabot[bot] in #​171
• Fix the broken link for GitHub Help Documentation by @​subramani95 in #​174
• bump ct and yamale version by @​cpanato in #​178
• Bump actions/checkout from 4.2.2 to 5.0.0 by @​dependabot[bot] in #​181
• Bump actions/setup-python from 5.4.0 to 6.0.0 by @​dependabot[bot] in #​179
• Bump the actions group across 1 directory with 2 updates by @​dependabot[bot] in #​183
• Use uv instead of python venv by @​nikolaik in #​172
• Bump sigstore/cosign-installer from 3.8.1 to 4.0.0 by @​dependabot[bot] in #​184

New Contributors

• @​subramani95 made their first contribution in #​174
• @​nikolaik made their first contribution in #​172

Full Changelog: helm/chart-testing-action@v2...v2.8.0

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