Bump Ruby image to 3.1 and Helm version to 3.9.4

What does this MR do and why?

This MR updates both the Ruby version used by default, aligned with https://gitlab.com/gitlab-org/charts/gitlab/-/blob/master/.gitlab-ci.yml?ref_type=heads#L572, and the minimum Helm version to be aligned with https://gitlab.com/gitlab-org/charts/gitlab/-/blob/master/.gitlab-ci.yml?ref_type=heads#L32 (recently merged in gitlab-org/charts/gitlab!3451 (merged))

Filename has been renamed for convenience.

The resulting image will be used in https://gitlab.com/gitlab-org/charts/gitlab/-/blob/master/.gitlab-ci.yml?ref_type=heads#L28 and https://gitlab.com/gitlab-org/charts/gitlab/-/blob/master/.gitlab-ci.yml?ref_type=heads#L913 for consolidation.

Related MR:

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Edited by Ismael Posada Trobo

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