[ admin ] Cure bitrot in publish CI

Several actions had been updated and their predecessors deprecated (for
example, https://github.blog/changelog/2024-04-16-deprecation-notice-v3-of-the-artifact-actions/)

Thankfully a fairly straightforward patch.

Author: CodingCellist

.github/workflows/publish.yaml

@@ -1,7 +1,7 @@
 name: Deploy website to GitHub Pages
 
 env:
-  WC_HUGO_VERSION: '0.123.7'
+  WC_HUGO_VERSION: '0.136.5'
 
 on:
   # Trigger the workflow every time you push to the `main` branch
@@ -44,7 +44,7 @@ jobs:
           ${{ runner.os }}-hugomod-
     - name: Setup Pages
       id: pages
-      uses: actions/configure-pages@v3
+      uses: actions/configure-pages@v5
     - name: Build with Hugo
       env:
         HUGO_ENVIRONMENT: production
@@ -54,7 +54,7 @@ jobs:
     - name: Generate Pagefind search index
       run: npx pagefind --source "public"
     - name: Upload artifact
-      uses: actions/upload-pages-artifact@v2
+      uses: actions/upload-pages-artifact@v3
       with:
         path: ./public
 
@@ -69,4 +69,4 @@ jobs:
     steps:
     - name: Deploy to GitHub Pages
       id: deployment
-      uses: actions/deploy-pages@v2
+      uses: actions/deploy-pages@v4