ci: upgrade Node.js 20 to 22 (deprecation deadline June 2026)

GitHub Actions will force Node.js 24 starting June 2, 2026 and
remove Node.js 20 on September 16, 2026. Upgrading to 22 now
eliminates the deprecation warnings.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ccross2

.github/workflows/daily-post.yml

@@ -28,7 +28,7 @@ jobs:
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: "20"
+          node-version: "22"
           cache: npm
 
       - name: Install dependencies

.github/workflows/deploy.yml

@@ -21,7 +21,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: 20
+          node-version: 22
           cache: npm
       - run: npm ci
       - run: npm run check