[beta6] Update URL in code example

Problem/Motivation

Some URL from https://git.drupalcode.org/project/ui_suite_dsfr/-/blob/1.0.x/ui_example... were moved by upstream.

Example:

"#attributes":
   src: "https://code.gouv.fr/icons/binaire-256.png"
   style: "display: block; margin: auto;"

Proposed resolution

Find the new URL and update the example.