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 (source)	final	major	24.04 → 26.04

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[gemini-code-assist]

Code Review

This pull request attempts to update the base Docker image from Ubuntu 24.04 to Ubuntu 26.04. However, Ubuntu 26.04 is not yet a released stable LTS version, and using this tag will cause the Docker build to fail. Additionally, external package repositories configured in the Dockerfile do not yet support this version. It is recommended to revert this change and remain on the stable 24.04 LTS release.

[gemini-code-assist]

Ubuntu 26.04 is not a released stable LTS version of Ubuntu. Attempting to use mirror.gcr.io/library/ubuntu:26.04 as a base image will cause the Docker build to fail because the tag does not exist or is unstable. Additionally, many of the external package repositories configured in this Dockerfile (such as Microsoft SQL Server/ODBC packages) do not yet support Ubuntu 26.04. Please revert this change and stick to the stable 24.04 LTS release.

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