Fix formatting issue in SignatureBoxGroup class

[microshine]

This pull request fixes a formatting issue in the SignatureBoxGroup class. It addresses the incorrect calculation of the byte range and ensures that the range of bytes points to the correct data. The changes include updates to the PDFDocumentUpdate class and the SignatureBoxGroup class.

The update inclueds tests for:

• %%EOF with EOL should have valid state if EOL is:
  • 'empty'
  • '\n'
  • '\r\n'
  • '\n\n'
  • '\n\n\n'
  • should return invalid state if there are 'Too many bytes after %%EOF marker'
  • should return invalid state if there are 'EOL contains invalid characters'
  • should return invalid state if there are 'Document contains extra bytes after signed data'
• ByteRange
  • should return invalid state if ByteRange[0] points to incorrect data
  • should return invalid state if ByteRange[1] points to incorrect data
  • should return invalid state if ByteRange[2] points to incorrect data

All possible endings of the update section in the PDF document, including '%%EOF\n', '%%EOF\n\n', and so on, have undergone thorough testing to ensure seamless integration with Acrobat Reader.

[github-actions]

NPM package v1.14.0 has been published 🎉