sync download-artifact and upload-artifact versions (#12)

in #9 we updated the download-artifact action, but neglected to upate the upload-artifact action, which led to incompatible versions being used

Author: alrikai

.github/workflows/build-docs.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Build Jekyll
         uses: actions/jekyll-build-pages@v1
       - name: Upload Jekyll Artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4.4.0
         with:
           name: jekyll-site
           path: _site
@@ -29,7 +29,7 @@ jobs:
         with:
           lfs: 'true'
       - name: Download Jekyll Artifact
-        uses: actions/[email protected].7
+        uses: actions/[email protected].8
         with:
           name: jekyll-site
           path: _site