ci: actions/checkout and actions/setup-node v4 -> v7

Every run now warns that both actions target Node.js 20, which GitHub is
retiring on its runners. v5 of each moved to Node 24; v7 is current. No
workflow here uses pull_request_target or workflow_run (the checkout v7
change), and no package.json carries packageManager (the setup-node v5
auto-cache change), so nothing else moves.

Author: lroolle

.github/workflows/deploy.yml

@@ -41,7 +41,7 @@ jobs:
     runs-on: ubuntu-latest
     timeout-minutes: 20
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
 
       # Fail here rather than after a four-minute build, and fail with the
       # command that fixes it. A workflow whose first bad day costs you a build
@@ -64,7 +64,7 @@ jobs:
             exit 1
           fi
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v7
         with:
           node-version: 22
           cache: npm