Update actions/upload-artifact version to v3.1.2 in GitHub Actions workflow for improved stability.

Author: TMHSDigital

.github/workflows/pages.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Debug Build Output
         run: ls -la ./_site
       - name: Upload artifact
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v3.1.2
         with:
           name: pages-artifact
           path: ./_site