fix: Cast message and detail attributes before appending exception notes (#5114)

Cast `message` and `detail` attributes on exceptions to string before
generating the `value` of the Sentry exception.

Prevents an unhandled `TypeError` when these attributes are `bytes`, as
`get_error_message()` attempts to append string exception notes.

Resolves the exception described in
#5050.

Author: alexander-alderman-webb

sentry_sdk/utils.py

@@ -654,7 +654,7 @@ def get_errno(exc_value):
 
 def get_error_message(exc_value):
     # type: (Optional[BaseException]) -> str
-    message = (
+    message = safe_str(
         getattr(exc_value, "message", "")
         or getattr(exc_value, "detail", "")
         or safe_str(exc_value)