Update GitHub Artifact Actions (#63)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/tests.yml

@@ -114,7 +114,7 @@ jobs:
     - name: Test
       run: |
         tox -e ${{ matrix.config[1] }}
-    - uses: actions/upload-artifact@v6
+    - uses: actions/upload-artifact@v7
       with:
         name: dist-${{ matrix.config[1] }}-${{ matrix.config[2] }}  # dist-exe-windows-latest
         path: dist
@@ -188,7 +188,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - uses: actions/download-artifact@v7
+      - uses: actions/download-artifact@v8
         with:
           pattern: dist-*
           path: dist