chore(deps): update quay.io/helmpack/chart-testing docker tag to v3.8.0

This MR contains the following updates:

Package	Type	Update	Change
quay.io/helmpack/chart-testing	image	minor	v3.7.1 -> v3.8.0

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Release Notes

helm/chart-testing

v3.8.0

Compare Source

What's Changed

• add skip-clean-up option to not remove the charts when finishing the tests by @​cpanato in https://github.com/helm/chart-testing/pull/478
• add .ct in current working-directory as config directory by @​itscaro in https://github.com/helm/chart-testing/pull/479
• Fix parsing kubectl output with warnings by @​usmonster in https://github.com/helm/chart-testing/pull/470
• Upgrade to go 120 by @​cpanato in https://github.com/helm/chart-testing/pull/523
• Update docs and examples for v3.7.1 by @​ljtill in https://github.com/helm/chart-testing/pull/527
• sync version comments, update actions and update cosign flag by @​cpanato in https://github.com/helm/chart-testing/pull/538

New Contributors

• @​itscaro made their first contribution in https://github.com/helm/chart-testing/pull/479
• @​usmonster made their first contribution in https://github.com/helm/chart-testing/pull/470
• @​dklimpel made their first contribution in https://github.com/helm/chart-testing/pull/534
• @​ljtill made their first contribution in https://github.com/helm/chart-testing/pull/527

Full Changelog: https://github.com/helm/chart-testing/compare/v3.7.1...v3.8.0

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