bump to Ubuntu 24.04 CI workflow

Author: boegel

.github/workflows/deploy.yml

@@ -5,7 +5,7 @@ on:
     branches: main
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
     - name: checkout
       uses: actions/checkout@v2
@@ -15,7 +15,7 @@ jobs:
     - name: set up Python
       uses: actions/setup-python@v1
       with:
-        python-version: 3.8
+        python-version: 3.9
 
     - name: install mkdocs
       run: |

.github/workflows/test.yml

@@ -3,15 +3,15 @@ name: build tutorial
 on: [push, pull_request]
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-24.04
     steps:
     - name: checkout
       uses: actions/checkout@v2
 
     - name: set up Python
       uses: actions/setup-python@v1
       with:
-        python-version: 3.8
+        python-version: 3.9
 
     - name: Codespell action
       uses: codespell-project/actions-codespell@master