Update dependency kubernetes-sigs/prometheus-adapter to v0.12.0

This MR contains the following updates:

Package	Type	Update	Change
kubernetes-sigs/prometheus-adapter		minor	v0.11.2 -> v0.12.0
kubernetes-sigs/prometheus-adapter	ironbank-github	minor	v0.11.2 -> v0.12.0

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Release Notes

kubernetes-sigs/prometheus-adapter (kubernetes-sigs/prometheus-adapter)

v0.12.0

Compare Source

Changes since v0.11.0

Improvements

• Register and improve prometheus client http metrics that were previously unregistered (#​599, @​bogo-y)
• Add new flag to disable HTTP/2 (#​618, @​machine424)
• Bump Golang to 1.22.2, Kubernetes libraries to 1.30.0 and other dependencies to their latest version (#​659, @​dgrisonnet)

Bug fixes

• Fix multi-arch image build (#​601, @​dgrisonnet)

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