💚 Fix readthedocs CI

Author: Freed-Wu

.readthedocs.yaml

@@ -6,9 +6,8 @@ build:
   os: ubuntu-22.04
   tools:
     python: "3"
-  apt_packages:
-    - lua-ldoc
-    - lua-discount
   commands:
+    - sudo apt-get -y update
+    - sudo apt-get -y install lua-ldoc lua-discount
     - ldoc .
     - mv doc $READTHEDOCS_OUTPUT/html