v2 still points to v2.6.0 and not v2.6.1

[froblesmartin]

Hi! :)

Simple thing, https://github.com/helm/chart-testing-action/tree/v2/ currently points to the same commit as https://github.com/helm/chart-testing-action/tree/v2.6.0, instead of https://github.com/helm/chart-testing-action/tree/v2.6.1.