Fix bare except clauses in _pp.py: use except Exception

[koteshyelamati]

Fix 7 bare except: clauses in ppft/_pp.py that catch BaseException (including SystemExit, KeyboardInterrupt, GeneratorExit), replacing them with except Exception:.

Affected methods:

• RWorker.connect() (line 219): network send errors
• Server.__init__ stats check (line 539): time query errors
• Server._connect1() (line 617): connection errors
• Server._submit() (line 694): thread start errors
• Server._run_local() (line 746): local task execution errors
• Server._run_remote() (line 781): remote task execution errors
• Worker cleanup (line 853): process kill errors

Bare except: clauses are bad practice (PEP 8 / flake8 E722) because they silently swallow KeyboardInterrupt and SystemExit, making programs impossible to interrupt cleanly.