fix: use urlopen with User-Agent and BytesIO for Poppins font download

Author: mfishma

.github/scripts/generate_showcase.py

@@ -151,8 +151,9 @@ def main():
     try:
         # Try to get a system font or download one
         url = "https://github.com/google/fonts/raw/main/ofl/poppins/Poppins-Bold.ttf"
-        urllib.request.urlretrieve(url, "Poppins-Bold.ttf")
-        font = ImageFont.truetype("Poppins-Bold.ttf", 120)
+        req = urllib.request.Request(url, headers={'User-Agent': 'Mozilla/5.0'})
+        font_bytes = BytesIO(urllib.request.urlopen(req).read())
+        font = ImageFont.truetype(font_bytes, 120)
     except Exception:
         font = ImageFont.load_default()