Bump versions in CI

Author: FichteFoll

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ jobs:
   flake8:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup Python 3.8
         uses: actions/setup-python@v5

.github/workflows/gh-pages.yml

@@ -7,9 +7,10 @@ on:
 
 jobs:
   deploy:
-    runs-on: ubuntu-20.04
+    name: Create and publish documentation
+    runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - name: Setup Python 3.8
         uses: actions/setup-python@v5