ci: move workflows to Node 24 actions

Issue: #145
User-Visible: no

.github/workflows/mutation-gate.yml

@@ -31,12 +31,12 @@ jobs:
     # нормально: гейт предрелизный. Час — потолок против зависшего Chromium.
     timeout-minutes: 60
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
         with:
           ref: dev
           fetch-depth: 0
 
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v7
         with:
           node-version: 22
           cache: npm
@@ -45,7 +45,7 @@ jobs:
 
       - name: Кэш браузеров Playwright
         id: pw
-        uses: actions/cache@v4
+        uses: actions/cache@v6
         with:
           path: ~/.cache/ms-playwright
           key: playwright-${{ runner.os }}-${{ hashFiles('package-lock.json') }}