v2.4.0

• Dependency Updates:
  • AWS SDK v2 from 2.16.86 to 2.17.247 (pull request)
  • AWS SDK v1 from 1.12.7 to 1.12.276 (pull request)
  • Kinesis Consumer Library from 1.14.0 to 1.14.8 (pull request)
  • Guava from 29.0-jre to 30.0-jre (pull request)
  • Jackson from 2.12.1 to 2.12.7 (pull request)
• Relax validation to support new AWS regions without SDK update (pull request)