Bump the actions group with 2 updates (#13464)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/release.yml

@@ -28,7 +28,7 @@ jobs:
           pip install build twine
       - run: python -m build --sdist --wheel
       - run: twine check --strict dist/*
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v5
         with:
           name: dist
           path: dist
@@ -43,7 +43,7 @@ jobs:
       name: pypi
       url: https://pypi.org/p/mne
     steps:
-      - uses: actions/download-artifact@v5
+      - uses: actions/download-artifact@v6
         with:
           name: dist
           path: dist