Merge pull request #350 from fusion-energy/fixing-ci-option2

pinned ubuntu version in ci

Author: shimwell

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     strategy:
       matrix:
         python-version: ["3.12"]

.github/workflows/documentation_update.yml

@@ -17,7 +17,7 @@ permissions:
 jobs:
   testing:
     name: Documentation
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     steps:
       - name: checkout actions
         uses: actions/checkout@v4