switch gcp auth to updated actions

[jbolda]

Motivation

The last deploy on the main branch failed. Fix so we can deploy again.

W0103 20:08:25.644046    [30](https://github.com/thefrontside/playhouse/actions/runs/3832572592/jobs/6523039621#step:12:31)38 gcp.go:119] WARNING: the gcp auth plugin is deprecated in v1.22+, unavailable in v1.26+; use gcloud instead.
To learn more, consult https://cloud.google.com/blog/products/containers-kubernetes/kubectl-auth-changes-in-gke
Error: UPGRADE FAILED: execution error at (backstage-mincharts/templates/secrets.yaml:15:33): You must provide a Auth Session Client Secret

Approach

Rather than using the gcloud calls, I switch to use the action. I suspect this will require less effort on our end to maintain.

Alternate Designs

Use the plugin in which the error suggests.

Possible Drawbacks or Risks

Hard to test this without hitting the merge button.

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[frontsidejack]

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