Update venue information for JuMP-dev 2025

Author: odow

_posts/2024-09-26-jump_dev_2025.md

@@ -63,6 +63,8 @@ The workshop will take place in downtown Auckland.
 The first two days of JuMP-dev will be held at the [GridAKL](https://gridakl.com)
 in downtown Auckland, New Zealand.
 
+Enter the building from Pakenham St West and turn left down the corridor.
+
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 ### Dinner