[FEATURE] Keep OpenSearch Security Plugin SIGMA rules up to date as of Dec 2023

[hoang-vo]

As a security analyst and operator,

I want to utilise up-to-date SIGMA rules in the OpenSearch Security Plugin, so that I can utilise current contributions from the opensource community.

For example - at the time of writing this - the Okta rules in Security Plugin repo (main branch) have not been updated since February 2023 - with 13 rules available , while the SIGMA repo (master branch) Okta rules were last updated in December 2023 - with 21 rules available, notably including rules based on the high-profile Okta breach in 2023.

[praveensameneni]

Thank you @hoang-vo for the request. We plan to update the rules in 2.13 and have an open PR for continuous updates