CI - update GitHub actions to node20 (#6462)

Bump up to actions/upload-artifact@v4 compatible with node20.

Ref: actions/upload-artifact#444 (comment)

Finalize #6445

Author: pavoljuhas

.github/workflows/ci-weekly.yml

@@ -29,7 +29,7 @@ jobs:
         run: pip install -r dev_tools/requirements/isolated-base.env.txt
       - name: Notebook tests
         run: check/pytest -n auto -m weekly dev_tools/notebooks/isolated_notebook_test.py -k ${{matrix.partition}}
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         if: failure()
         with:
           name: notebook-outputs

.github/workflows/ci.yml

@@ -298,7 +298,7 @@ jobs:
         run: pip install -r dev_tools/requirements/isolated-base.env.txt
       - name: Notebook tests
         run: check/pytest -n auto -m slow dev_tools/notebooks/isolated_notebook_test.py -k ${{matrix.partition}}
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         if: failure()
         with:
           name: notebook-outputs
@@ -316,7 +316,7 @@ jobs:
         run: pip install -r dev_tools/requirements/notebooks.env.txt
       - name: Notebook tests
         run: check/pytest -n auto -m slow dev_tools/notebooks/notebook_test.py
-      - uses: actions/upload-artifact@v2
+      - uses: actions/upload-artifact@v4
         if: failure()
         with:
           name: notebook-outputs