use conda openjdk

MatthewSZhang · MatthewSZhang · commit 7fddb29aaea0 · 2025-09-23T18:27:25.000+08:00
diff --git a/.readthedocs.yml b/.readthedocs.yml
@@ -1,11 +1,8 @@
 version: 2
 build:
-  os: ubuntu-22.04
+  os: ubuntu-24.04
   tools:
     python: "mambaforge-latest"
-  apt_packages:
-    - default-jre # for plantuml
-    - graphviz # for plantuml
 
 conda:
   environment: rtd-environment.yml
