fix: replace bare except clauses with specific exception types

[koteshyelamati]

Summary

Replace bare except: clauses with specific exception types across 5 files.

Changes

File	Line	Old	New	Reason
jc/parsers/proc_driver_rtc.py	131	except:	except ValueError:	int(val) raises ValueError on bad input
jc/parsers/xrandr.py	371	except:	except IndexError:	line[i] raises IndexError past end of string
jc/parsers/xrandr.py	506	except:	except Exception:	_Line.categorize() may raise various exceptions
tests/test_yaml.py	11	except:	except ImportError:	import fallback
tests/test_jc_cli.py	9, 15	except:	except ImportError:	import fallbacks
tests/test_xml.py	9	except:	except ImportError:	import fallback
tests/test_xml.py	17	except:	except Exception:	version parse error

Why

Bare except: silently swallows KeyboardInterrupt, SystemExit, and GeneratorExit — signals that should propagate. Each fix uses the most specific type that covers the actual exception raised.