Update NumPy New Contributors' Hour schedule (#851)

Author: InessaPawson

calendars/numpy.yaml

@@ -64,8 +64,8 @@ events:
       follow the link: https://hackmd.io/3f3otyyuTte3FU9y3QzsLg
 
       Join us via Zoom: https://numfocus-org.zoom.us/j/82563808729?pwd=ZFU3Z2dMcXBGb05YemRsaGE1OW5nQT09
-    begin: 2025-12-11 22:00:00 +00:00
-    end: 2025-12-11 23:00:00 +00:00
+    begin: 2026-04-30 22:00:00 +00:00
+    end: 2026-04-30 23:00:00 +00:00
     url: https://numfocus-org.zoom.us/j/82563808729?pwd=ZFU3Z2dMcXBGb05YemRsaGE1OW5nQT09
     repeat:
       interval: