Update the simple game server version to 0.6.

[roberthbailey]

What type of PR is this?

Uncomment only one /kind <> line, press 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: Update everywhere to the new container image version.

Which issue(s) this PR fixes:

Closes #

Special notes for your reviewer:

[agones-bot]

Build Failed 😱

Build Id: a0c94f61-51b1-4324-a91f-7e27c89f0d85

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[roberthbailey]

Flake in e2e-feature-gates: panic: test timed out after 10m0s

[agones-bot]

Build Succeeded 👏

Build Id: 13c5cc79-dde5-4248-b0f1-e9ae470386a6

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

• image: gcr.io/agones-images/agones-controller:1.20.0-dce7b77
• image: gcr.io/agones-images/agones-ping:1.20.0-dce7b77
• Linux C++ SDK (build): agonessdk-1.20.0-dce7b77-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.20.0-dce7b77.zip

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

• https://dce7b77-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2413/head:pr_2413 && git checkout pr_2413
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.20.0-dce7b77

[agones-bot]

Build Succeeded 👏

Build Id: b4e6e251-bcd5-4cb1-a49a-4f51d65275f0

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

• image: gcr.io/agones-images/agones-controller:1.20.0-3fe6923
• image: gcr.io/agones-images/agones-ping:1.20.0-3fe6923
• Linux C++ SDK (build): agonessdk-1.20.0-3fe6923-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.20.0-3fe6923.zip

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

• https://3fe6923-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/2413/head:pr_2413 && git checkout pr_2413
• helm install ./install/helm/agones --namespace agones-system --name agones --set agones.image.tag=1.20.0-3fe6923

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cindy52, markmandel, roberthbailey

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• OWNERS [markmandel,roberthbailey]

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