Add info about NumPy 2.0 development meeting (#374)

Author: InessaPawson

calendars/numpy.yaml

@@ -1,5 +1,10 @@
 name: NumPy Community Calendar
 events:
+  - summary: NumPy 2.0 development meeting
+    begin: 2023-04-03 15:00:00 +00:00
+    end: 2023-04-03 19:00:00 +00:00
+    url: https://numfocus-org.zoom.us/j/87080449579?pwd=dmt5dktCT2l1NG5ZNGFvb3dKdUNIdz09
+    
   - summary: NumPy Community Call
     description: |
       A fortnightly meeting to share updates on everything