irc-meetings/2023a.md: updated proposed start time

docs/devel/irc-meetings/2023a.md

@@ -5,16 +5,16 @@ See more details below.***
 
 Date:
 
--   **Proposed: 14:30 UTC, Tuesday, Dec 05, 2023**
+-   **Proposed: 15:00 UTC, Tuesday, Dec 05, 2023**
     -   can attend: dcm, vseva, qxork, ...
     -   cannot attend:
 
 Time of the meeting across the world:
 
--   15:30 - Berlin, Germany
--   14:30 - London, UK
--   09:30 - New York, USA
--   06:30 - Seattle, USA
+-   16:00 - Berlin, Germany
+-   15:00 - London, UK
+-   10:00 - New York, USA
+-   07:00 - Seattle, USA
 
 **Place:**