update artifact actions to v4

Author: JeanElsner

.github/workflows/main.yml

@@ -73,7 +73,7 @@ jobs:
           PYLINT_SCORE=$(sed -n 's/^Your code has been rated at \([-0-9.]*\)\/.*/\1/p' ./pylint/pylint.log)
           anybadge --label=Pylint --file=pylint/pylint.svg --value=$PYLINT_SCORE 2=red 4=orange 8=yellow 10=green
       - name: Upload linting artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: linting
           path: ./pylint
@@ -95,7 +95,7 @@ jobs:
       - name: Build with Sphinx
         run: cd doc && make html
       - name: Upload documentation artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: documentation
           path: ./doc/_build/html
@@ -105,12 +105,12 @@ jobs:
     needs: [documentation, linting]
     steps:
       - name: Download documentation artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: documentation
           path: ./html
       - name: Download linting artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: linting
           path: ./html
@@ -123,4 +123,4 @@ jobs:
       - name: Deploy to GitHub Pages
         id: deployment
         uses: actions/deploy-pages@v2
-      
+