Bump actions/checkout from 4 to 7

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: actions/setup-node@v4
         with:
           node-version: 22

.github/workflows/deploy.yml

@@ -20,7 +20,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           # lastUpdated reads git history; without this every page claims to
           # have been updated at the moment of the build.

.github/workflows/sync.yml

@@ -38,7 +38,7 @@ jobs:
   sync:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: actions/setup-node@v4
         with:
           node-version: 22

.github/workflows/vulnerabilities.yml

@@ -24,7 +24,7 @@ jobs:
     name: npm audit
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       # High and critical only: a moderate advisory in a dev-server dependency
       # is worth an update, not a red build.
       - run: npm audit --audit-level=high