fix: parenthesize multi-catch that only parses on 3.14

PEP 758 syntax requires Python 3.14, but the script metadata declares
requires-python >= 3.11. Reported by ty check run per #15187.

Author: peda-cos

web_programming/crypto_price_tracker.py

@@ -24,7 +24,7 @@ def crypto_price(coin: str = "bitcoin") -> float:
     url = f"https://api.coingecko.com/api/v3/simple/price?ids={coin}&vs_currencies=usd"
     try:
         json_response = httpx2.get(url, timeout=10).raise_for_status().json()
-    except httpx2.RequestError, ValueError, KeyError:
+    except (httpx2.RequestError, ValueError, KeyError):
         return 0.0
     return float(json_response.get(coin, {}).get("usd", 0.0))