[LTP] ci: doc: Replace Ubuntu bionic with noble

[linuxtestproject.agent@gmail.com]

Hi Petr,

On Fri, 17 Apr 2026, Petr Vorel wrote:
> ci: doc: Replace Ubuntu bionic with noble

> -          - container: "ubuntu:bionic"
> +          - container: "ubuntu:noble"

> -    * - Ubuntu 18.04 LTS bionic
> -      - 4.15
> -      - 2.27
> -      - 7.3.0
> -      - \-

Clean fix. bionic removal from both the workflow and the doc table is correct.

Reviewed-by: LTP AI Reviewer <ltp-ai@noreply.github.com>

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