kube-metrics-adapter: Update to version kube-metrics-adapter-0.2.6-13-g23f65af

[k8s-on-aws-manager-app]

• Use stdlib context package kube-metrics-adapter#847
• Bump the github-actions group with 4 updates kube-metrics-adapter#849
• scheduled-scaling: Handle mili values (fractions) in target value kube-metrics-adapter#846
• Bump golang.org/x/crypto from 0.43.0 to 0.45.0 kube-metrics-adapter#844
• Bump the all-go-mod-patch-and-minor group across 1 directory with 11 updates kube-metrics-adapter#850

[zalando-robot]

Deployment Checklist

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• Thorough load-testing has been performed, and is documented in the description/comment.
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