Update GitHub workflow

.github/workflows/build.yml

@@ -6,28 +6,37 @@ on:
   pull_request:
     branches: [ main ]
 
+env:
+  PYTHON_VERSION: "3.10"
+
 jobs:
   build:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python 3.9
-      uses: actions/setup-python@v2
+    - name: Checkout
+      uses: actions/checkout@v4
+
+    - name: Set up Python
+      uses: actions/setup-python@v4
       with:
-        python-version: 3.9
+        python-version: ${{ env.PYTHON_VERSION }}
+
     - name: Install dependencies
       run: |
         sudo apt-get update
         sudo apt-get install --yes zopfli pngquant
         python -m pip install --upgrade pip
-        python -m pip install -r https://raw.githubusercontent.com/dmlls/whatsapp-emoji-linux/main/requirements.txt
+        python -m pip install -r requirements.txt
+
     - name: Build WhatsAppEmoji
       run: |
         make -j
         make install
+
     - name: Upload .ttf file
-      uses: actions/upload-artifact@v2
+      uses: actions/upload-artifact@v4
       with:
         name: WhatsAppEmoji
         path: build/WhatsAppEmoji.ttf
+