ci: run release on Node 24

npm@latest now requires Node >=22, so the 'npm install -g npm@latest'
step (needed for OIDC trusted publishing) fails on the Node 20 runner.

Author: MattJackson

.github/workflows/release.yml

@@ -24,7 +24,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: "20"
+          node-version: "24"
           registry-url: "https://registry.npmjs.org"
 
       - name: Use an npm that supports OIDC trusted publishing