Bump actions/setup-node from 4 to 7

Bumps [actions/setup-node](https://github.com/actions/setup-node) from 4 to 7.
- [Release notes](https://github.com/actions/setup-node/releases)
- [Commits](actions/setup-node@v4...v7)

---
updated-dependencies:
- dependency-name: actions/setup-node
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/site-build.yaml

@@ -26,7 +26,7 @@ jobs:
         uses: pnpm/action-setup@0977fd99725f1db4007ccb2928dbb4e90d06cc86 # v6.0.10
 
       - name: Use Node.js 22
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v7
         with:
           node-version: 22
 
@@ -62,7 +62,7 @@ jobs:
         uses: pnpm/action-setup@0977fd99725f1db4007ccb2928dbb4e90d06cc86 # v6.0.10
 
       - name: Use Node.js 22
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v7
         with:
           node-version: 22
 
@@ -87,7 +87,7 @@ jobs:
         uses: pnpm/action-setup@0977fd99725f1db4007ccb2928dbb4e90d06cc86 # v6.0.10
 
       - name: Use Node.js 22
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v7
         with:
           node-version: 22