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 upgrade the base Docker image from Ubuntu 24.04 to Ubuntu 26.04. However, feedback indicates that this upgrade is premature and will break the build due to toolchain upgrades, missing OpenSSL 1.1.1 required by older Python versions, and other potential driver incompatibilities. It is recommended to revert back to Ubuntu 24.04.

[gemini-code-assist]

Upgrading the base image to Ubuntu 26.04 is premature and will break the build. Ubuntu 26.04 is not yet a stable LTS release, and the image may not be available in the mirror. Furthermore, older Python versions (such as 3.7, 3.8, and 3.9) defined in PYTHON_VERSIONS will fail to compile on newer Ubuntu versions due to toolchain upgrades and the absence of older OpenSSL versions (like OpenSSL 1.1.1) which these Python versions require. Other installations, such as the Microsoft ODBC driver (currently configured for Ubuntu 20.04) and Chrome/Chromedriver, may also be incompatible. Please stick to the stable Ubuntu 24.04 LTS release.

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