chore(deps): update mirror.gcr.io/library/ubuntu docker tag to v26

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
mirror.gcr.io/library/ubuntu	final	major	24.04 → 26.04

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[gemini-code-assist]

Code Review

This pull request attempts to update the base image in the Dockerfile from Ubuntu 24.04 to 26.04. Feedback indicates that Ubuntu 26.04 is not a released version and does not exist in the registry, which will cause the Docker build to fail. It is recommended to revert this change to a valid LTS version.

[gemini-code-assist]

The Ubuntu version 26.04 is not a released version of the operating system and does not exist in the registry. Ubuntu LTS releases follow a biennial cycle, and the next LTS (26.04) is not expected until 2026. This change will cause the Docker build to fail with a 'manifest not found' error. It appears the automated dependency update incorrectly identified the next major LTS version before its release. Additionally, any future base image upgrade should also address version-specific configurations elsewhere in the file, such as the Microsoft SQL Server repository on line 103 (currently pinned to 20.04) and the deprecated apt-key usage.

FROM mirror.gcr.io/library/ubuntu:24.04