Fix code scanning alert no. 1: CSRF protection not enabled

[saturnflyer]

Fixes https://github.com/SOFware/close_encounters/security/code-scanning/1

To fix the CSRF vulnerability, we need to enable CSRF protection in the ApplicationController class. The best way to do this in a Rails application is to use the protect_from_forgery method with the :exception strategy. This will raise an exception if an invalid CSRF token is encountered, providing a robust defense against CSRF attacks.

Steps to implement the fix:

1. Add the protect_from_forgery with: :exception line to the ApplicationController class.
2. Ensure that this change is made in the test/dummy/app/controllers/application_controller.rb file.

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