CI: remove deprecated/removed RTD config

bsipocz · bsipocz · commit 568d7f7f8f75 · 2023-08-29T16:17:13.000-07:00
diff --git a/.readthedocs.yaml b/.readthedocs.yaml
@@ -15,7 +15,6 @@ sphinx:
 # Install regular dependencies.
 # Then, install special pinning for RTD.
 python:
-  system_packages: false
   install:
     - method: pip
       path: .
