Update autoscaler-webhook: Switch from debian11 to debian12

[Kalaiselvi84]

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
/kind release

What this PR does / Why we need it:

Which issue(s) this PR fixes:

Work on #3570

Special notes for your reviewer:

[Kalaiselvi84]

Successful build log

[agones-bot]

Build Succeeded 👏

Build Id: 82d66898-b173-4866-b299-ca177770a47a

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

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.38.0-dev-0faf044-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.38.0-dev-0faf044-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.38.0-dev-0faf044-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.38.0-dev-0faf044-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.38.0-dev-0faf044-amd64
• Linux C++ SDK (build): agonessdk-1.38.0-dev-0faf044-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.38.0-dev-0faf044-amd64.zip

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

• https://0faf044-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3575/head:pr_3575 && git checkout pr_3575
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.38.0-dev-0faf044-amd64

[markmandel]

Thank you for updating these while in here - my tooling kept automatically updating these 👍🏻

[agones-bot]

Build Succeeded 👏

Build Id: 5ed7faed-0130-4050-b43a-d6df0e120f8e

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

• image: us-docker.pkg.dev/agones-images/ci/agones-controller:1.38.0-dev-d484c2b-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-extensions:1.38.0-dev-d484c2b-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-sdk:1.38.0-dev-d484c2b-linux-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-ping:1.38.0-dev-d484c2b-amd64
• image: us-docker.pkg.dev/agones-images/ci/agones-allocator:1.38.0-dev-d484c2b-amd64
• Linux C++ SDK (build): agonessdk-1.38.0-dev-d484c2b-amd64-linux-arch_64.tar.gz
• SDK Server: agonessdk-server-1.38.0-dev-d484c2b-amd64.zip

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

• https://d484c2b-dot-preview-dot-agones-images.appspot.com/

To install this version:

• git fetch https://github.com/googleforgames/agones.git pull/3575/head:pr_3575 && git checkout pr_3575
• helm install agones ./install/helm/agones --namespace agones-system --set agones.image.registry=us-docker.pkg.dev/agones-images/ci --set agones.image.tag=1.38.0-dev-d484c2b-amd64