Update github action versions

.github/workflows/build.yml

@@ -4,9 +4,9 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python 3.11
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: '3.11'
     - name: Install flake8
@@ -18,13 +18,13 @@ jobs:
   unit:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python 3.11
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: '3.11'
     - name: Cache pip
-      uses: actions/cache@v2
+      uses: actions/cache@v4
       with:
         path: ~/.cache/pip
         key: pip-${{ runner.os }}-${{ secrets.CACHE_VERSION }}-${{ hashFiles('requirements.txt') }}
@@ -43,11 +43,11 @@ jobs:
   styles:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Install Node.js
-        uses: actions/setup-node@v3
+        uses: actions/setup-node@v4
         with:
-          node-version: '18.x'
+          node-version: '20.x'
       - name: Install npm packages
         run: npm ci
       - name: Build style.css

.github/workflows/caniuse.yml

@@ -7,7 +7,7 @@ jobs:
     if: github.repository == 'DMOJ/online-judge'
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Download Can I use... data
       run: |
         curl -s https://raw.githubusercontent.com/Fyrd/caniuse/master/data.json | python3 -m json.tool > resources/caniuse.json

.github/workflows/compilemessages.yml

@@ -10,9 +10,9 @@ jobs:
   compilemessages:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Set up Python 3.11
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: '3.11'
     - name: Checkout submodules

.github/workflows/updatemessages.yml

@@ -7,11 +7,11 @@ jobs:
     if: github.repository == 'DMOJ/online-judge'
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
       with:
         fetch-depth: 0
     - name: Set up Python 3.11
-      uses: actions/setup-python@v4
+      uses: actions/setup-python@v5
       with:
         python-version: '3.11'
     - name: Checkout submodules