Fix dependency installation

Author: TheAssassin

.github/workflows/main.yml

@@ -7,8 +7,8 @@ jobs:
     name: Content checks
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Install dependencies
-        run: apt-get update && apt-get install pipx && pipx install poetry
+        run: sudo apt-get update && sudo apt-get install pipx && pipx install poetry
       - name: Link check
         run: ./make.sh linkcheck