stop using Ubuntu 20.04 in CI workflows

Author: boegel

.github/workflows/build.yml

@@ -7,7 +7,7 @@ permissions:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - name: checkout
         uses: actions/checkout@v3

.github/workflows/deploy.yml

@@ -8,7 +8,7 @@ permissions:
   contents: write # to fetch code (actions/checkout) + deploy docs to GitHub Pages (gh-pages branch)
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - name: checkout
         uses: actions/checkout@v3

.github/workflows/detect_html.yml

@@ -4,7 +4,7 @@ on: [push, pull_request]
 
 jobs:
   html-check:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
       - name: Checkout code
         uses: actions/checkout@v3

.github/workflows/script_module_list.yml

@@ -14,7 +14,7 @@ permissions: read-all
 jobs:
 
   flake8-lint:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     name: Lint
     steps:
       - name: Check out source repository
@@ -46,4 +46,4 @@ jobs:
       - name: Test with pytest
         run: |
           cd scripts/available_software
-          ./test.sh
+          ./test.sh