Bump actions/setup-node from 6 to 7

Recreates dependabot PR #1876 on an in-repo branch.

Dependabot-triggered runs resolve secrets from the Dependabot secret
store rather than the Actions store, so secrets.ADO_NPM_FEED_TOKEN came
through empty and every job running `npm ci` failed with npm E401. The
repo .npmrc points `registry=` at the codat-npm ADO feed, so a missing
credential breaks the whole install, not just @codat/sdk-link-types.

setup-node@v7 itself is fine — it ran green on the dependabot branch;
only the subsequent install step failed.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: pmckinney-codat

.github/workflows/check-formatting.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Setup Node.js
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@v7
         with:
           node-version: '20'
           cache: 'npm'

.github/workflows/check-markdown-lint.yml

@@ -24,7 +24,7 @@ jobs:
         uses: actions/checkout@v6
 
       - name: Set up Node.js
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@v7
         with:
           node-version: '20'
           cache: 'npm'

.github/workflows/check-spelling.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Setup Node.js
-        uses: actions/setup-node@v6
+        uses: actions/setup-node@v7
         with:
           node-version: '20'
           cache: 'npm'

.github/workflows/pr.yml

@@ -24,7 +24,7 @@ jobs:
           # build ships LFS pointer files instead of the actual binaries
           lfs: true
 
-      - uses: actions/setup-node@v6
+      - uses: actions/setup-node@v7
         with:
           node-version: 24
           cache: npm
@@ -144,7 +144,7 @@ jobs:
           # the checkout is only needed so the action can push to gh-pages
           lfs: ${{ github.event.action != 'closed' }}
 
-      - uses: actions/setup-node@v6
+      - uses: actions/setup-node@v7
         if: github.event.action != 'closed'
         with:
           node-version: 24