chore: move Bouncy Castle dependency to test scope

[mrdziuban]

Fixes

Fixes #749 by moving the Bouncy Castle dependency to the test scope

Checklist

• I acknowledge that all my contributions will be made under the project's license
• I have made a material change to the repo (functionality, testing, spelling, grammar)
• I have read the Contribution Guidelines and my PR follows them
• I have titled the PR appropriately
• I have updated my branch with the main branch
• I have added tests that prove my fix is effective or that my feature works
• I have added the necessary documentation about the functionality in the appropriate .md file
• I have added inline documentation to the code I modified

If you have questions, please file a support ticket.

[mrdziuban]

@shrutiburman would you mind taking a look at this when you have a chance? Thank you!

[Thunderforge]

I know I'm not a project approver, but it looks good to me. And I'd really like to see this merged and a new version released so Snyk scans for our app can stop reporting this issue.

[k163377]

Are there any plans for this to be a merge release?