Update download-artifact action to version 4 (#150)

* Update download-artifact action to version 4

* Upgrade download-artifact action to version 4

Author: tmigot

.github/workflows/Deploy-internal.yml

@@ -62,7 +62,7 @@ jobs:
           wget https://github.com/JuliaSmoothOptimizers/JSOTutorials.jl/archive/refs/heads/gh-pages.zip
           unzip gh-pages.zip
       - name: Download artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           path: .
       - name: list

.github/workflows/Deploy-website.yml

@@ -70,7 +70,7 @@ jobs:
       BRANCH: 'jsotutorials-${{ github.event_name }}-${{ github.sha }}'
     steps:
       - name: Download artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           path: .
       - name: list