docs(about us): bump outside contributor number (#27073)

docs/usage/about-us.md

@@ -2,7 +2,7 @@
 
 Renovate was created by [Mend](https://www.mend.io/) staff and they continue to work on Renovate.
 
-More than 950 outside contributors helped improve Renovate.
+More than 1000 outside contributors helped improve Renovate.
 
 ## Special thanks