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 upgrade the base Docker image from Ubuntu 24.04 to Ubuntu 26.04. However, feedback indicates that Ubuntu 26.04 is not yet released and upgrading will break the Docker build because the tag is unavailable and external dependencies do not yet support it. It is recommended to revert this change and stick to the stable 24.04 version.

[gemini-code-assist]

Upgrading to Ubuntu 26.04 is premature and will break the Docker build. Ubuntu 26.04 LTS is not yet released, so the 26.04 tag is not available or stable. Furthermore, many of the external repositories and packages installed in this Dockerfile (such as Microsoft ODBC, Docker CE, and Bazel) do not yet support Ubuntu 26.04, which will cause subsequent installation steps to fail. Please revert this change and stick to the stable LTS version 24.04.

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