Bump the artifacts group with 2 updates

Bumps the artifacts group with 2 updates: [actions/upload-artifact](https://github.com/actions/upload-artifact) and [actions/download-artifact](https://github.com/actions/download-artifact).


Updates `actions/upload-artifact` from 3 to 4
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v3...v4)

Updates `actions/download-artifact` from 3 to 4
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4)

---
updated-dependencies:
- dependency-name: actions/upload-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: artifacts
- dependency-name: actions/download-artifact
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: artifacts
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -232,7 +232,7 @@ jobs:
         run: python -m build
 
       - name: Upload distribution files
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: dist-packages
           path: dist/
@@ -246,7 +246,7 @@ jobs:
       - name: Fetch sources
         uses: actions/checkout@v4
       - name: Download package
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: dist-packages
           path: dist
@@ -296,7 +296,7 @@ jobs:
           mike set-default $MIKE_VERSION
 
       - name: Upload site
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: docs-site
           path: site/
@@ -386,7 +386,7 @@ jobs:
     runs-on: ubuntu-20.04
     steps:
       - name: Download distribution files
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: dist-packages
           path: dist
@@ -432,7 +432,7 @@ jobs:
       id-token: write
     steps:
       - name: Download distribution files
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: dist-packages
           path: dist