Update Kontra security training token

What does this MR do and why?

Update Kontra security training token to a new one since the existing one is invalid. This is a band-aid fix. I am discussing a long-term solution with Kontra over email: #436629 (comment 1750149416)

Fixes: #436629 (closed)

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

project = Project.last
provider = Security::TrainingProvider.find_by_name('Kontra')
identifier_external_id = '[CWE]-[89]-[CWE-89]'
Security::TrainingProviders::KontraUrlService.new(project, provider, identifier_external_id).execute
=> {:name=>"Kontra", :url=>"https://application.security/gitlab/free-application-security-training/owasp-top-10-sql-injection", :status=>"completed", :identifier=>"CWE-89"}

If nil url is returned, try restarting rails-background-jobs as this code uses reactive caching which executes in sidekiq.