Remove stale org members blocking apply-org-config

[Copilot]

Config changes proposed in this pull request

• apply-org-config was failing because Peribolos could not apply membership updates for stale/non-resolvable GitHub accounts in config.yaml, causing the workflow to exit on a 422 after repeated 404 membership update attempts.
• Member list cleanup
  • Removed invalid member entries that no longer resolve or cannot be processed by GitHub membership APIs:

    members:
      - abinggeli
      # removed stale entries: 6f1045, DaOneMoD, GinaBiondo-aperto, mariusreusch, monkold, RCBiczok

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