feat: Turn unraisable exception integration on by default (#5044)

Add `UnraisablehookIntegration` to the default integrations list.

Author: alexander-alderman-webb

sentry_sdk/integrations/__init__.py

@@ -1,5 +1,6 @@
 from abc import ABC, abstractmethod
 from threading import Lock
+import sys
 
 from sentry_sdk.utils import logger
 
@@ -73,6 +74,11 @@ def iter_default_integrations(with_auto_enabling_integrations):
     "sentry_sdk.integrations.threading.ThreadingIntegration",
 ]
 
+if sys.version_info >= (3, 8):
+    _DEFAULT_INTEGRATIONS.append(
+        "sentry_sdk.integrations.unraisablehook.UnraisablehookIntegration"
+    )
+
 _AUTO_ENABLING_INTEGRATIONS = [
     "sentry_sdk.integrations.aiohttp.AioHttpIntegration",
     "sentry_sdk.integrations.anthropic.AnthropicIntegration",