Update doxygen_gen.yml

Author: kmilo17pet

.github/workflows/doxygen_gen.yml

@@ -8,7 +8,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     steps:
     - name: Checkout repository and submodules
       uses: actions/checkout@v4