Replace bare except clause with specific exception types in info_image_updates_available

[Copilot]

Addresses review feedback on PR #113 regarding a bare except: clause with no explanatory comment at line 693 in src/nethsec/inventory/__init__.py.

Changes

• Replace bare except: with specific exception types: subprocess.SubprocessError, json.JSONDecodeError, OSError
• Add explanatory comment describing why exceptions are caught and silently handled

# Before
except:
    pass

# After
except (subprocess.SubprocessError, json.JSONDecodeError, OSError):
    # Return False if the update check fails due to subprocess errors,
    # invalid JSON response, or file system issues (e.g., missing command)
    pass

The function maintains its safe default behavior of returning False when update checks fail, while making exception handling explicit and maintainable.

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