What does this MR do?
Doc: Update repository signing key expriation date
Update the repository signing key expriration date to match as of 2022-03-02, following the actions upon #6701 (closed)
New date: 2024-03-01
Paragraph added to call out how to update key materia
See Definition of done.
For anything in this list which will not be completed, please provide a reason in the MR discussion
Merge Request Title, and Description are up to date, accurate, and descriptive
MR targeting the appropriate branch
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