chore: modernize GitHub Actions workflow

- Update Node.js matrix from 16/18/20 to 20/22/24 (active LTS versions)
- Bump all actions to v4 (checkout, setup-node, upload/download-artifact)
- Bump codecov-action from v3 to v5 with token support
- Replace separate cache action with setup-node built-in caching
- Use npm ci instead of npm install for reproducible builds
- Replace timezone action with TZ environment variable
- Scope triggers to master branch and add pull_request trigger

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Gido Manders

.github/workflows/workflow.yml

@@ -1,42 +1,36 @@
 name: Node.js CI
 
-on: [push]
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
 
 jobs:
   build:
     runs-on: ubuntu-latest
 
     strategy:
       matrix:
-        node-version: [16.x, 18.x, 20.x]
+        node-version: [20, 22, 24]
+
+    env:
+      TZ: Europe/Amsterdam
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
           node-version: ${{ matrix.node-version }}
-      - uses: actions/cache@v3
-        with:
-          path: ~/.npm
-          key: ${{ runner.os }}-${{ matrix.node-version }}-node-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-${{ matrix.node-version }}-node-
-            ${{ runner.os }}-node-
-            ${{ runner.os }}-
-      - name: Setup timezone
-        uses: zcong1993/setup-timezone@v1.1.2
-        with:
-          timezone: Europe/Amsterdam
-      - run: npm install
+          cache: npm
+      - run: npm ci
       - run: npm run lint
       - run: npm run test:ts
       - run: npm run test:coverage
       - run: npm run tsc
-        env:
-          CI: true
-      - uses: actions/upload-artifact@v3
-        if: matrix.node-version == '20.x'
+      - uses: actions/upload-artifact@v4
+        if: matrix.node-version == 24
         with:
           path: ./coverage
           name: code-coverage
@@ -46,17 +40,15 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/download-artifact@v3
+      - uses: actions/checkout@v4
+      - uses: actions/download-artifact@v4
         with:
           name: code-coverage
           path: ./coverage
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v5
         with:
+          token: ${{ secrets.CODECOV_TOKEN }}
           directory: ./coverage
           flags: unittests
-          name: codecov-umbrella
           fail_ci_if_error: true
-          path_to_write_report: ./coverage/codecov_report.txt
-          verbose: true