fix: replace bare except with except Exception in _logger.py

[TrueFurina]

Summary

In the async-generator context manager (loguru/_logger.py), a bare
except: re-raises after the StopAsyncIteration case is handled. A bare
except also catches KeyboardInterrupt/SystemExit before re-raising them,
which is unnecessary and hides intent.

Replace with except Exception: — behavior is identical (the handler always
re-raises), but only expected exceptions are intercepted.

Verification

• python -m py_compile loguru/_logger.py → OK
• grep -rn "except:" loguru/ → 0 remaining bare handlers

Files changed

• loguru/_logger.py (1 line)