Upgrade readthedocs config

ConorMacBride · ConorMacBride · commit d5913f4321ae · 2023-10-07T22:41:10.000+01:00
https://blog.readthedocs.com/drop-support-system-packages/
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
@@ -6,7 +6,6 @@ build:
     python: "3.11"
 
 python:
-  system_packages: false
   install:
     - method: pip
       path: .
