v2.3.0

• #289 Support omitting the SigningCertificate property
• #282 Prevent Observable Timing Discrepancy
• Update different dependencies:
  • JAXB runtime from 4.0.4 to 4.0.5 (#292)
  • Guava from 32.1.3-jre to 33.2.1-jre (#293)
  • Bouncy Castle from 1.77 to 1.78.1 (#286 , #290)