fix: replace bare except with except Exception in open_las

[AmSach]

Description

Replaces 3 bare except: clauses in laspy/lib.py's open_las() function with except Exception:.

Why

Bare except: clauses catch all exceptions, including BaseException-derived classes like KeyboardInterrupt and SystemExit. This can:

1. Prevent clean program termination on Ctrl+C
2. Catch exceptions that should propagate up to the interpreter
3. Make the code's intent unclear (is it catching errors or signals?)

The intent of the existing code is clear: if the LasReader/LasWriter/LasAppender constructor fails, close the stream and re-raise. This is application-level error handling, so Exception is the right base class.

Pattern Consistency

This also matches the existing pattern used throughout the codebase:

• laspy/lasreader.py: except Exception as e:
• laspy/laswriter.py: except Exception as e:
• laspy/lasappender.py: except Exception as e:

Diff

-        except:
+        except Exception:
             if closefd:
                 stream.close()
             raise

(3 occurrences, in the r, w, and a mode branches)

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