Update gh action upload-artifact to v4.

v3 will be deprecated in early December

Author: emiliom

.github/workflows/build-image.yml

@@ -117,7 +117,7 @@ jobs:
           cat conda-packages.txt >> $GITHUB_STEP_SUMMARY
 
       - name: Archive Conda Package List
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: conda-packages
           path: conda-packages.txt

.github/workflows/build-pixi-image.yml

@@ -117,7 +117,7 @@ jobs:
           cat conda-packages.txt >> $GITHUB_STEP_SUMMARY
 
       - name: Archive Conda Package List
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: conda-packages
           path: conda-packages.txt