fix(major deps): update major dependencies (major)

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postcss-cli	11.0.1 → 12.0.0
sigs.k8s.io/structured-merge-diff/v6	v6.4.2 → v7.0.0

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Release Notes

postcss/postcss-cli (postcss-cli)

v12.0.0

Compare Source

• If using a YAML config, the yaml package must be installed separately (#​478)
• Requires Node.js v22+ (#​525)
• Errors if --config is passed, but no config is found (#​467, #​522)
• Now properly exits with an error if invalid options/configuration are passed in watch mode (#​527)
• Upgrade to chokidar v5; which results in slightly different handling of dir-dependency messages in watch mode (#​501)
• Properly watchs all config files if there are multiple config files (#​536)
• Minimized dependencies by removing fs-extra (#​510)
• Internal refactoring

kubernetes-sigs/structured-merge-diff (sigs.k8s.io/structured-merge-diff/v6)

v7.0.0

Compare Source

• Updates to Go 1.27
• Switches from json-iterator serialization to stdlib json/v2 serialization

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[renovate]

ℹ️ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• The go directive was updated for compatibility reasons

Details:

Package	Change
go	1.26.6 -> 1.27