Update upload artifact to v4 to avoid being "automatically failed because it uses a deprecated version"

Author: bc-pi

.github/workflows/archive.yml

@@ -37,6 +37,6 @@ jobs:
         token: ${{ github.token }}
 
     - name: "Save Archive"
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         path: archive.json

.github/workflows/ghpages.yml

@@ -63,7 +63,7 @@ jobs:
         token: ${{ github.token }}
 
     - name: "Archive Built Drafts"
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         path: |
           draft-*.html

.github/workflows/publish.yml

@@ -56,6 +56,6 @@ jobs:
         make: upload
 
     - name: "Archive Submitted Drafts"
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         path: "draft-*-[0-9][0-9].xml"