chore(deps): bump BouncyCastle.Cryptography in /Box.V2 (#947)

Bumps [BouncyCastle.Cryptography](https://github.com/bcgit/bc-csharp) from 2.2.1 to 2.3.1.
- [Commits](bcgit/bc-csharp@release-2.2.1...release-2.3.1)

---
updated-dependencies:
- dependency-name: BouncyCastle.Cryptography
  dependency-type: direct:production
...

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