Revise SECURITY.md for supported versions and reporting

[aleroycz]

Updated the security policy to include details on supported versions and vulnerability reporting.

Description

Please describe your changes in detail.

Related Issue

Link to the issue this PR solves (if any):
Fixes #XXX

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Refactor / code style
• Tests / CI

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Screenshots / Logs (if applicable)