build executables with Python 3.9 (#1922)

and also build a x86 Python 3.8 version for Windows 7 compatibility

.github/workflows/executables.yml

@@ -9,24 +9,31 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-latest, macOS-latest, windows-latest]
+        os: ["windows-latest", "ubuntu-latest", "macOS-latest"]
+        python-version: ["3.9"]
+        architecture: ["x64"]
+        include:
+        - os: "windows-2016"
+          python-version: "3.8"
+          architecture: "x86"
 
     steps:
     - uses: actions/checkout@v2
 
-    - name: Set up Python
+    - name: Set up Python ${{ matrix.python-version }} ${{ matrix.architecture }}
       uses: actions/setup-python@v2
       with:
-        python-version: 3.8
+        python-version: ${{ matrix.python-version }}
+        architecture: ${{ matrix.architecture }}
 
     - name: Build executable
       run: |
-        pip install requests requests[socks] urllib3==1.25.11 yt-dlp pyinstaller
+        pip install requests==2.25.1 requests[socks] urllib3==1.25.11 yt-dlp pyinstaller
         python scripts/pyinstaller.py
 
     - name: Upload executable
       uses: actions/upload-artifact@v2
       with:
-        name: gallery-dl-${{ matrix.os }}
+        name: gallery-dl-${{ matrix.os }}-${{ matrix.architecture }}-${{ matrix.python-version }}
         path: |
           dist