infra/clusters: use teraform 0.14

[spiffxp]

Part of issue to upgrade the version of terraform used by our modules: #2020

The upgrade guide looked significantly less scary, given that we aren't doing anything too complex: https://www.terraform.io/upgrade-guides/0-14.html

You will need to successfully complete a terraform apply at least once under Terraform v0.13 before upgrading an existing configuration to Terraform v0.14.

This was the only thing that jumped out at me, and we have done this by way of deploying the last few PRs

I'm interested in this bump for three reasons:

• to get us one step closer to the latest release
• to be able to use dependency lock files
• to be able to use sensitive values in plan output (e.g. if we wanted something to run plan as a part of a presubmit...)

To verify this:

terraform init
terraform plan
# 0 changes expected

I have not run terraform apply for any of these. Up to you whether this should happen prior to merge, or post-merge

[spiffxp]

/cc @ameukam

[spiffxp]

/uncc @alejandrox1

[ameukam]

Ran terraform apply -auto-approve -refresh
TF states are converted to 0.14.0

No changes as expected. .terraform.lock.hcl is created locally.

/lgtm

[k8s-ci-robot]

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[sftim]

Followed by #2217