ci: bump workflow actions to v5 (Node 24 runtime)

GitHub forces the Node-20 action runtime to Node 24 as of 2026-06-16; the
v1.0.2 release run warned on checkout@v4 + setup-node@v4. Bump all workflow
actions to their latest major (Node 24):

- ci.yml: checkout v4->v5, setup-node v4->v5, upload-pages-artifact v3->v5,
  deploy-pages v4->v5 (floating tags, per this repo CI convention)
- release.yml: checkout -> 93cb6ef # v5.0.1, setup-node -> a0853c2 # v5.0.0
  (SHA-pinned, per this repo release-hardening convention)

No package change - workflows are not in the npm tarball, so no version bump.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: mcp-tool-shop

.github/workflows/ci.yml

@@ -33,8 +33,8 @@ jobs:
       matrix:
         node-version: [20, 22]
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@v5
+      - uses: actions/setup-node@v5
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm ci
@@ -58,8 +58,8 @@ jobs:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@v5
+      - uses: actions/setup-node@v5
         with:
           node-version: 22
       - name: Install site dependencies
@@ -68,8 +68,8 @@ jobs:
       - name: Build site
         working-directory: site
         run: npm run build
-      - uses: actions/upload-pages-artifact@v3
+      - uses: actions/upload-pages-artifact@v5
         with:
           path: site/dist
       - id: deployment
-        uses: actions/deploy-pages@v4
+        uses: actions/deploy-pages@v5

.github/workflows/release.yml

@@ -15,12 +15,12 @@ jobs:
     timeout-minutes: 15
 
     steps:
-      - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd  # v5.0.1
         with:
           fetch-depth: 0
 
       - name: Setup Node
-        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020  # v4.4.0
+        uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444  # v5.0.0
         with:
           node-version: '22'
           registry-url: 'https://registry.npmjs.org'