Update actions/checkout action to v7

Author: renovate[bot]

.github/workflows/generatepdf.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v6
+    - uses: actions/checkout@v7
 
     - name: generate pdf
       run: |

.github/workflows/translatereadme.yml

@@ -10,7 +10,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - name: Setup Node.js
         uses: actions/setup-node@v7
         with: