chore: update to Node 24

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: birtles

.github/renovate.json

@@ -14,7 +14,7 @@
     },
     {
       "matchPackageNames": ["node", "actions/node-versions", "@types/node"],
-      "allowedVersions": "22.x"
+      "allowedVersions": "24.x"
     }
   ]
 }

.github/workflows/push.yml

@@ -12,7 +12,7 @@ jobs:
       - uses: actions/setup-node@v6
         with:
           cache: pnpm
-          node-version: 22
+          node-version: 24
       - run: |
           pnpm install
           pnpm tsc --noEmit