[BUG] unnecessary lock statements

[zivillian]

Describe the Bug

I'm tracing my application for increased CPU usage after switching from openssl to bc-csharp and my profiler shows a lot of time is spent in AbstractTlsContext.get_SecurityParameters()

I'm not yet sure if this is the reason for the increased CPU usage in my application, but as far as I can tell the lock statement in all those properties will not do anything useful and may decrease the performance.

I'm happy to create a PR which removes the locks in this class, but I wanted to make sure, that I haven't missed anything.

Screenshots and Logs

Product Deployment

Please complete the following information:

• Deployment format: docker on arm
• Version 2.4.0