ci: bump checkout/setup-node to v5 (Node 24 runtime)

Clears the "Node.js 20 actions are deprecated" warning surfaced on the
v1.6.0 publish run. actions/checkout@v5 and actions/setup-node@v5 run on
Node 24; node-version stays '22' (the project's required runtime, an
unrelated knob the action still honors).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: itayinbarr

.github/workflows/pages.yml

@@ -27,7 +27,7 @@ jobs:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - name: Configure Pages
         uses: actions/configure-pages@v5
         with:

.github/workflows/publish.yml

@@ -15,9 +15,9 @@ jobs:
       contents: write   # required to create the GitHub Release
       id-token: write   # required for npm provenance via GitHub OIDC
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v5
         with:
           # Must match package.json#engines.node (>= 22.19.0); pi 0.75+ requires it.
           node-version: '22'