Update ubuntu-latest to ubuntu-24.04 and node from 18 to 20

Author: stumbo

.github/workflows/gh-pages.yml

@@ -43,7 +43,7 @@ defaults:
 env:
   # ----------------------------------------------------------------------------
   # Specify the deployment environment:  staging or production
-  HUGO_ENVIRONMENT: production
+  HUGO_ENVIRONMENT: staging
   HUGO_VERSION: 0.133.1
 
 jobs:
@@ -56,7 +56,7 @@ jobs:
       zoteroVersion: ${{ fromJson(steps.zoteroVersion.outputs.headers).last-modified-version }}
       cacheHit: ${{ steps.cache-zotero-bib.outputs.cache-hit }}
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     concurrency:
       group:  ${{ github.workflow }}-${{ github.ref }}
     steps:
@@ -85,7 +85,7 @@ jobs:
   #      
   build:
     needs: check
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     if:  github.event_name == 'push' || needs.check.outputs.cacheHit != 'true'
     steps:
       - uses: actions/checkout@v4
@@ -134,7 +134,7 @@ jobs:
       - name: Setup Node
         uses: actions/setup-node@v4
         with:
-          node-version: 18
+          node-version: 20
 
       - run: npm install -g autoprefixer --save-dev  
       - run: npm install -g postcss-cli --save-dev
@@ -155,7 +155,7 @@ jobs:
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     needs: build
 
     steps: