Move OpenSUSE Leap 15.5 to deprecated operating systems

Clemens Beckrequested to merge
cb-drop-leap-15-5-docs into master

What does this MR do and why?

Move OpenSUSE Leap 15.5 to deprecated operating systems

OpenSUSE Leap 15.5 went EOL in December 2025 and was announced to be removed in GitLab 17.9.

Relates omnibus-gitlab#8778 (closed)

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