fix(releases): add missing npm upgrade step (#2758)

Accidentally removed this in a previous PR.

.github/workflows/changesets-pr.yml

@@ -1,4 +1,4 @@
-name: 🦋 Changeset PR
+name: 🦋 Changesets PR
 
 on:
   push:

.github/workflows/release.yml

@@ -56,6 +56,11 @@ jobs:
           node-version: 20.19.0
           cache: "pnpm"
 
+      # npm v11.5.1 or newer is required for OIDC support
+      # https://github.blog/changelog/2025-07-31-npm-trusted-publishing-with-oidc-is-generally-available/#whats-new
+      - name: Setup npm 11.x for OIDC
+        run: npm install -g npm@11.6.4
+
       - name: Install dependencies
         run: pnpm install --frozen-lockfile