Add support for flat config and types

[TheElegantCoding]

Please add support for ESLint 9, including Flat config support.

See:

• https://eslint.org/docs/latest/use/configure/configuration-files-new
• https://eslint.org/blog/2022/08/new-config-system-part-1/
• https://eslint.org/blog/2022/08/new-config-system-part-2/
• https://eslint.org/docs/latest/use/configure/migration-guide

Thanks!

[nzakas]

https://github.com/eslint-community/eslint-plugin-security?tab=readme-ov-file#flat-config-requires-eslint--v8230