[llvm] Add ics link for Floating Point WG (PR #82545)

[Andy Kaylor via llvm-commits]

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@@ -232,7 +232,8 @@ what to add to your calendar invite.
      - `Meeting details/agenda <https://docs.google.com/document/d/1Ry8O4-Tm5BFj9AMjr8qTQFU80z-ptiNQ62687NaIvLs/edit?usp=sharing>`__
    * - Floating Point Working Group
      - Every 3rd Wednesday of the month
-     - `gcal <https://calendar.google.com/calendar/u/0?cid=MDI1ODI1MDdiYWM3OWQxODY5MDA3MTI1NjZlYzNmYzY5YjMzYWMyNGQ3ZGUwYThjNzZjN2IxOTk3NmYxOTBjMEBncm91cC5jYWxlbmRhci5nb29nbGUuY29t>`__
+     - `ics <https://calendar.google.com/calendar/ical/02582507bac79d186900712566ec3fc69b33ac24d7de0a8c76c7b19976f190c0%40group.calendar.google.com/public/basic.ics>`__
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andykaylor wrote:

It should be fixed now

https://github.com/llvm/llvm-project/pull/82545