chore(deps): update docker/dockerfile docker tag to v1.26 (alauda-v2.3.1)

[alaudaa-renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker/dockerfile	syntax	minor	1.21 -> 1.26

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[danielfbm]

PR Assist Bot — Owner Approval Needed

This PR targets release branch alauda-v2.3.1. Per policy, release-branch merges require explicit owner approval before the bot proceeds.

PR: AlaudaDevops/golangci-lint#55
Branch: alauda-v2.3.1
Type: Security / Dependency update (Renovate)

Please reply with /approve-merge or provide explicit approval for the bot to merge this PR on the next sweep.

[alaudabot]

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