Upgrade Terraform to 1.18

[markmandel]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:

/kind breaking

/kind bug
/kind cleanup
/kind documentation
/kind feature
/kind hotfix

What this PR does / Why we need it:

Upgrade the Terraform scripts for all Kubernetes clusters to 1.18

Which issue(s) this PR fixes:

Work on #1971

Special notes for your reviewer:

Doing some smoke tests with 1.18 seem to be passing.

[agones-bot]

Build Failed 😱

Build Id: 366a654b-43a0-439a-874c-b35f0110c6d2

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[agones-bot]

Build Succeeded 👏

Build Id: 7bcae0c2-8d64-483c-bd5c-6854abdb2a93

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:1.13.0-deeede2
• image: gcr.io/agones-images/agones-sdk:1.13.0-deeede2
• image: gcr.io/agones-images/agones-ping:1.13.0-deeede2
• Linux C++ SDK (build): agonessdk-1.13.0-deeede2-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.13.0-deeede2.zip

A preview of the website (the last 30 builds are retained):

• https://deeede2-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1988/head:pr_1988 && git checkout pr_1988
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.13.0-deeede2

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: markmandel, roberthbailey

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [markmandel,roberthbailey]

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[google-oss-robot]

New changes are detected. LGTM label has been removed.

[agones-bot]

Build Succeeded 👏

Build Id: 33ee5d89-a80a-4b68-accb-13224dff5810

The following development artifacts have been built, and will exist for the next 30 days:

• image: gcr.io/agones-images/agones-controller:1.13.0-632dfcf
• image: gcr.io/agones-images/agones-sdk:1.13.0-632dfcf
• image: gcr.io/agones-images/agones-ping:1.13.0-632dfcf
• Linux C++ SDK (build): agonessdk-1.13.0-632dfcf-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.13.0-632dfcf.zip

A preview of the website (the last 30 builds are retained):

• https://632dfcf-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/1988/head:pr_1988 && git checkout pr_1988
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.13.0-632dfcf