feat: update user metrics plot

Author: sanjayankur31

source/General/Metrics.md

@@ -7,7 +7,7 @@ Please note that this script can only be run by OSBv2 administrators as it requi
 
 For usage metrics for OSBv1, please refer to [this page](https://v1.opensourcebrain.org/projects#people).
 
-```{figure} ../images/20250724-osb-users-plot.png
+```{figure} ../images/20250828-osb-users-plot.png
 :alt: Plot showing number of OSBv2 users over time
 :align: center
 :width: 600px