other runner for linux

Author: galabovaa

.github/workflows/documentation.yml

@@ -7,7 +7,7 @@ on:
     types: [opened, synchronize, reopened]
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v4
       - uses: julia-actions/setup-julia@latest