Update sample.pem and test-kirk.jks in bwc-tests

[cwperks]

Description

The certs in the bwc-tests resources directory were replace, but the corresponding sample.pem and test-kirk.jks files were not replaced.

I am planning to go through different plugin repositories that have the demo certs checked in, and replace the checked in certs with a task to download certs from the security repo. See example PR in async search plugin: opensearch-project/asynchronous-search#650

In order to replace the certs, the security plugin needs the up-to-date sample.pem and test-kirk.jks files.

• Category (Enhancement, New feature, Bug fix, Test fix, Refactoring, Maintenance, Documentation)

Maintenance

Check List

• New functionality includes testing
• New functionality has been documented
• New Roles/Permissions have a corresponding security dashboards plugin PR
• API changes companion pull request created
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.70%. Comparing base (863b990) to head (63a9447).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4877      +/-   ##
==========================================
- Coverage   69.89%   69.70%   -0.20%     
==========================================
  Files         320      320              
  Lines       21688    21688              
  Branches     3460     3460              
==========================================
- Hits        15159    15117      -42     
- Misses       4735     4782      +47     
+ Partials     1794     1789       -5     

see 11 files with indirect coverage changes