Update the workflow actions to their current majors

actions/checkout v4 -> v7 and actions/setup-node v4 -> v6 in both workflows,
and the CI check job moves from Node 22 to 24 so it matches the runtime the
release job now uses. The test matrix deliberately stays 20/22/24: that is
what proves the package honours its own `engines: node >=20`.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

Author: AlexLovser

.github/workflows/ci.yml

@@ -17,10 +17,10 @@ jobs:
   check:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@v7
+      - uses: actions/setup-node@v6
         with:
-          node-version: "22.x"
+          node-version: "24.x"
           cache: npm
       - run: npm ci
       - run: npm run lint
@@ -34,8 +34,8 @@ jobs:
       matrix:
         node-version: ["20.x", "22.x", "24.x"]
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/checkout@v7
+      - uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
           cache: npm

.github/workflows/publish.yml

@@ -33,7 +33,7 @@ jobs:
       contents: read
       id-token: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - uses: actions/setup-node@v6
         with:
           node-version: "24"