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

GitHub deprecated Node 20 on runners in 2025-09; the v4 actions
emitted deprecation annotations on every run.

Author: Hank076

.github/workflows/codeql-analysis.yml

@@ -19,7 +19,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v5
 
     - name: Initialize CodeQL
       uses: github/codeql-action/init@v3

.github/workflows/i18n.yml

@@ -7,5 +7,5 @@ jobs:
     runs-on: ubuntu-latest
     name: Check locale key parity
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - run: node scripts/check-i18n.js

.github/workflows/main.yml

@@ -8,10 +8,10 @@ jobs:
     name: Style checks
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Setup Node.js environment
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v5
         with:
           node-version: 22
 
@@ -31,10 +31,10 @@ jobs:
         platform: ["chrome", "firefox"]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Setup Node.js environment
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v5
         with:
           node-version: 22
           cache: npm
@@ -50,10 +50,10 @@ jobs:
     needs: [build]
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Setup Node.js environment
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v5
         with:
           node-version: 22
           cache: npm

.github/workflows/release.yml

@@ -14,10 +14,10 @@ jobs:
     name: Build and publish Chrome extension ZIP
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Setup Node.js environment
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v5
         with:
           node-version: 22
           cache: npm