[koa-generic-session] Add a sameSite attribute to SessionOptions (#38422)
[koa-generic-session] Add a sameSite attribute to SessionOptions (#38422)

* Add a sameSite attribute to SessionOptions in koa-generic-session

* Update types/koa-generic-session/index.d.ts

Co-Authored-By: Orta <09a7bdfffdfb3669b37720a83b54617246926eb2@gmail.com>

dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,dsebastien/DefinitelyTyped,mcliment/DefinitelyTyped,markogresak/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped