Bump actions/upload-artifact from 4 to 5 (#230)

Author: llucax

.github/workflows/ci-pr.yaml

@@ -48,7 +48,7 @@ jobs:
           mike set-default $MIKE_VERSION
 
       - name: Upload site
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: docs-site
           path: site/

.github/workflows/ci.yaml

@@ -93,7 +93,7 @@ jobs:
         run: python -m build
 
       - name: Upload distribution files
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: dist-packages
           path: dist/
@@ -195,7 +195,7 @@ jobs:
           mike set-default $MIKE_VERSION
 
       - name: Upload site
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: docs-site
           path: site/