Fix speaker avatar

Author: NMertsch

src/models/pretalx.py

@@ -45,7 +45,7 @@ class PretalxSpeaker(BaseModel):
     code: str
     name: str
     biography: str | None = None
-    avatar: str
+    avatar_url: str
     submissions: list[str]
     answers: list[PretalxAnswer]
 

src/utils/transform.py

@@ -83,7 +83,7 @@ def pretalx_speakers_to_europython_speakers(
                 code=speaker.code,
                 name=speaker.name,
                 biography=speaker.biography,
-                avatar=speaker.avatar,
+                avatar=speaker.avatar_url,
                 slug=speaker_code_to_slug[speaker.code],
                 answers=speaker.answers,
                 submissions=speaker.submissions,