Update the name of architecture Slack channel
Why is this change being made?
This merge request updates the name of #architecture
Slack channel (internal only).
Author Checklist
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Provided a concise title for the MR -
Added a description to this MR explaining the reasons for the proposed change, per [say-why-not-just-what][transparency] -
CCed Gerir
/cc @glopezfernandez